The utility model discloses an auxiliary device is applyed to anti -skidding valve connector moment of torsion of EMUs braking belongs to rail vehicle and makes technical field, takes place the problem that the jack warp, causes the trouble among the anti -skidding valve connector of the current EMUs braking of the aim at solution butt joint tightening process because of connector butt joint fastening dynamics is improper. The utility model discloses an auxiliary device is applyed to anti -skidding valve connector moment of torsion of EMUs braking includes: the inner wall is the supplementary body of semicircular, the internal wall of subsidiary book is the sawtooth structure, the structure is exerted to the moment of torsion that lies in supplementary body afterbody, the moment of torsion is applyed the structural moment of torsion that is provided with and is applyed the hole, supplementary body and moment of torsion are exerted structural connection department and are provided with the connecting axle, and the elastic adjustment device of one end and connecting axle connection, during elastic adjustment device natural state, relative moment of torsion is applyed the structure inner wall and is stretched out, nose type of being triangle -shaped structure, and lateral wall and the internal wall of subsidiary book are located same circular arc to be equipped with the sawtooth structure.