The invention discloses a low-voltage current transformer comprehensive testing device and method. The testing device comprises a verification testing table. A conveying device is arranged on a detecting platform. A bar code scanning device, a deviation correcting positioning device and an integrated automatic wire connecting and dismounting device are sequentially arranged above the conveying device in the moving direction of the conveying device. After a transformer is conveyed to a verification station and verified, the transformer is returned according to the original path, and manual discharging and encasing are carried out. The deviation correcting positioning device comprises a deviation correcting push assembly and a deviation correcting positioning and clamping assembly. The deviation correcting push assembly comprises a fixed baffle, a plurality of push air cylinders are installed on the fixed baffle, each push air cylinder drives a movable baffle, and a guiding shaft is arranged between each movable baffle and the fixed baffle for guiding. The deviation correcting positioning and clamping assembly comprises a guide rail installed on the detecting platform, the guide rail is perpendicular to the moving direction of the current transformer, the guide rail is provided with electric cylinders capable of reciprocating along the guide rail, and the electric cylinders are provided with deviation correcting air pawls driving air pawls to clamp the transformer.