The invention discloses a mobile tripod leveling bearing platform device and a use method thereof. The device comprises a user-made tripod, a stripy groove, saw tooth grooves, telescopic foot helixes,track wheels and a square bearing platform plate, wherein three saw tooth grooves which do not penetrate through the bearing platform plate are formed in the top surface of the bearing platform plate; the three saw tooth grooves are formed in a regular triangle; the user-made tripod is arranged in the three saw tooth grooves and can be moved leftwards and rightwards; a through hole in which a detection instrument is mounted is formed in the center of the base of the user-made tripod; the stripy groove is flatly formed in the position of a central line of the regular triangle formed by the three saw tooth grooves and penetrates through the bearing platform plate; track wheels contacting a track are arranged close to four corners on the bottom surface of the bearing platform plate; one telescopic foot helix connected with the bearing platform plate is mounted above the cover plate of each track wheel. By adopting the device, the problems that a detection instrument in conventional subway protection monitoring cannot measure continuously and is difficultly arranged in place and great time and labor are acquired in leveling are solved.