The value of the pound has fallen by as much as 12% against the dollar, causing many people in Britain to lose their jobs.
China is still the world’s biggest economy, but many have been losing money and hope that the Brexit vote will help boost its exports.
But the pound’s slide has been less dramatic than in the US, the world trade leader, and it has fallen sharply against the yen, another key foreign currency.
The pound fell below $1.10 for the first time since mid-March, while the dollar has risen by about 5% against a basket of currencies.
The US dollar has fallen over 80% since Donald Trump became president and has fallen more than 15% against its biggest rival in the past year.
The yen is down about 10% against both the euro and the dollar this year.
US stocks have suffered as investors have shifted from equities to bonds.
The Dow Jones Industrial Average has fallen 10% this year and is on track to fall another 5% in 2019, according to data from the US Securities and Exchange Commission.
A drop in the dollar would make it harder for China to compete with the US in the global economy, said Patrick Dorsey, an investment strategist at RBC Capital Markets.
The Bank of England has also cut interest rates to zero.
US inflation is expected to average just 2% in the first quarter of 2019, down from 3% last year, according a Reuters poll.
A dollar is worth about 7.3% to the euro in the UK, compared with 7.8% in China.
A pound is worth 2.6% to yen in the United States, according the Bank of Japan.
The price of a kilogram of coal in China has risen 40% this decade, compared to a drop of only 7% in America, according data from Bloomberg.
But Mr Dorsey said that the impact of Brexit on China’s economy would not necessarily be felt for a few years.
“The impact will be minimal and that will be down to the volatility of the yuan and the rest of the world,” he said.
China’s stock market is currently trading at about $9.50, up more than 7% this month from the end of last year.
Its value is up about 14% in that period.
The dollar index is at a new record high, at 2,878.54 against the greenback.
The euro is trading at $1,266.60, up 1.4% on a basket basis.
The yuan was trading at 1,852.42, up 0.3%.
A euro note is worth 1.2335 euros, down 0.081% on Tuesday.
China has been the main beneficiary of the Brexit referendum, which brought Britain out of the EU.
It is now a net importer of US goods and services and the largest exporter of Chinese goods.
The UK voted to leave the EU on Thursday, but Prime Minister Boris Johnson said that Britain would continue to negotiate a free trade deal with the bloc.
“We want to do our fair share,” Mr Johnson said.
“It is up to the people of the UK and their government to decide if they want to continue to be in the EU or not.”