Restraint strap device with length convenient to adjust

The utility model discloses a restraint strap device with the length convenient to adjust. A restraint strap device with the length convenient to adjust comprises a mounting plate, a fixing part is arranged at the lower end of the mounting plate, a driving part and a box body connected with the driving part are arranged on the mounting plate, a ratchet wheel assembly is arranged on one side in the box body, and a ratchet wheel is arranged on the other side in the box body. One end of the ratchet wheel assembly is connected with an output shaft of the driving part through a connecting shaft, the other end of the ratchet wheel assembly is connected with a rotating disc, a restraint strap is connected outside the rotating disc in a surrounding mode, an opening for the restraint strap to pass through is formed in the box body, and the front end of the rotating disc is connected with the other side of the box body through a connecting part. A rocker assembly is arranged at the front end of the connecting piece, an