Gearbox stepping motor assembling tool

The gearbox stepping motor assembling tool comprises a base used for vertically fixing a stepping motor and a bending assembly used for bending a fixing piece on a stepping motor shell. The bending assembly comprises a sleeve, a spring arranged in the sleeve, a plug used for plugging the upper end of the sleeve and a pressure column. One end of the pressure column extends into the sleeve and abutsagainst the lower end of the spring. The lower end of the pressure column extends from the lower end of the sleeve to form a pressure head; a plurality of bending heads are arranged on the end face of the lower end of the sleeve, each bending head comprises a guide portion, a pre-bending portion and a bending portion, the inner side face of each guide portion is a first inclined face, the inner side face of each pre-bending portion is a second inclined face, the inner side face of each bending portion is a third inclined face, and the first inclined faces, the second inclined faces and the third inclined faces are se