The viral video app gets more hits than even the ubiquitous American search engine, according to Cloudflare, an IT security company.
The rankings show that TikTok knocked Google off the top spot in February, March and June this year, and has held the number one position since August.
Last year Google was first, and a number of sites including TikTok, Amazon, Apple, Facebook, Microsoft and Netflix were all in the top 10.
Cloudfare said it tracks data using its tool Cloudflare Radar, which monitors web traffic.