The invention discloses a device for stabilizing a torque platform. The inner surface of a positioning supporting cover is provided with two pairs of positioning protrusions. A motor positioning framework corresponding to a motor is formed by the two pairs of positioning protrusions together. Every pair of the two pairs of positioning protrusions is of the same category. A pair of associated protrusions are arranged, and the pair of positioning protrusions of the same category are close to the two ends of one of the associated protrusions correspondingly. The pair of positioning protrusions ofthe same category are arranged on walls, close to a motor, of a pair of binding pieces. One pair of the positioning protrusions are arranged in a mirror image manner, and in this way, the positioningprotrusions are combined with the pair of associated protrusions. The defects that in the prior art, the framework is nonstandard and the stability of the motor is deficient are effectively avoided.