"The safety of Chinese investment in the UK is being greatly threatened," he added.
Donald Trump last night took credit for countries like the UK ditching Huawei. "I did this myself for the most part," he said, in an apparent snub to Downing Street efforts to claim the new approach was because of a change in circumstances caused by US sanctions on the firm.
China's $15 trillion economy is five times the size of Britain's, Reuters reported.
The ambassador was speaking at the Centre for European Reform.
Washington and its allies maintain that China could use Huawei's equipment to spy on private and sensitive information, a claim the firm denies.