An oral cleaning detection system includes a remote data service platform and mobile smart device. The remote data service platform is built on a network platform including a tooth cleaning software module having a motion detection unit and reward unit; the mobile smart device may enter the remote data service platform to download the tooth cleaning software module, a photography equipment of the mobile smart device is turned on through the software to capture a user's teeth brushing motion, a motion track comparison is carried out with the tooth cleaning software module to judge whether a preset brushing motion is completed correctly, and at the same time, a user may be rewarded as an encouragement.