The invention discloses a power wrapping connector driving torque detection device of a test bed of a railway vehicle transmission system. The device is composed of a frequency modulation motor assembly (A), an overload protection mechanism assembly (B), a flange type torque meter (C), a power wrapping connector driving mechanism assembly (D) and a horizontal bearing platform (E). The frequency modulation motor assembly (A), the overload protection mechanism assembly (B), the flange type torque meter (C) and the power wrapping connector driving mechanism assembly (D) are fixed on the horizontal bearing platform (E) through a T-shaped volt; a power output shaft (4) of the frequency modulation motor assembly (A) is in key connection with the right end of the overload protection mechanism assembly (B); the left end of the overload protection mechanism assembly (B) is in bolt connection with the right end of a rotor in the flange type torque meter (C) through a No.2 flange (8); and the left end of the rotor in the flange type torque meter (C) is connected with a No.4 flange (23) of a transmission shaft assembly (a) in the power wrapping connector driving mechanism assembly (D) througha bolt.