- Zarah Sultana, 29, Labour MP for Coventry South, said she would use the platform on personal devices, which was allowed under new rules.
- Ms Sultana, one of the most followed MPs on TikTok, said it was a "very effective" way of reaching people.
An MP who has more than 400,000 TikTok followers said she would continue using the platform to reach younger people.
Zarah Sultana, 29, Labour MP for Coventry South, said she would use the platform on personal devices, which was allowed under new rules.
Ms Sultana, one of the most followed MPs on TikTok, said it was a "very effective" way of reaching people.
British government ministers have been banned from using the Chinese-owned social media app on security grounds.
Ms Sultana told BBC Politics Midlands cabinet minister Grant Shapps had said he would also continue using the platform.
Mr Shapps, a keen TikTokker, has said he had never used the platform on a government device.
"I've seen the advice for official phones and laptops to not have TikTok on them but Grant Shapps himself has said that he will continue to use TikTok on his personal device," Ms Sultana said.
"As a backbencher, it's also on my personal device so I'll continue to use the platform because I think it's really effective in reaching out to newer audiences, younger audiences and getting out political messages."
The government banned its use on work devices over fears sensitive data held on official phones could be accessed by the Chinese government.
However, the Chinese embassy in London said the move was motivated by politics "rather than facts" and would "undermine the confidence of the international community in the UK's business environment".