The invention relates to a breaker closing contact size measuring fixture. The breaker closing contact size measuring fixture comprises a bracket, a pedestal is connected with the downside of the bracket, the bracket is rotationally provided with a drive nut, a screw rod connected with a pull rod of a breaker to be measured is spirally arranged in the drive nut, the drive nut is connected with a drive handle, the screw rod is connected with a screw rod handle, and the breaker closing contact size measuring fixture further comprises an electrical signal detection device for detecting whether a moving contact moves to the closing contact position. The measuring fixture is simple in structure, the screw rod handle drives the screw rod to rotate to be in thread connection with the breaker pull rod and prevents the screw rod rotating when the drive nut rotates, the drive handle rotates the drive nut to drive the screw rod to move axially and prevents the drive nut rotating when the screw rod rotates, and the closing contact position is detected through the electrical signal detection device; the breaker closing contact size measuring fixture is capable of completely realizing the manual operation and realizing opening and closing slowly, and the moving contact duly stops moving when the moving contact arrives at the closing contact position so as to improve the measuring precision.