Maintenance clamping jig applied to server mainboard

The invention discloses a maintenance clamping jig applied to a server mainboard. The maintenance clamping jig comprises a supporting platform, a mounting plate arranged on the surface of the supporting platform and used for mounting the server mainboard, a horizontal moving mechanism movably arranged on the supporting platform in the width direction of the mounting plate, a vertical lifting mechanism movably arranged on the horizontal moving mechanism in the vertical direction, and a clamping device movably arranged on the vertical lifting mechanism along the length direction of the mounting plate and is used for clamping the side edge of the server mainboard. Thus, when the server mainboard is clamped and fixed, the position of the horizontal moving mechanism in the width direction of the supporting platform is adjusted according to the width size of the server mainboard, and then the position of the vertical lifting mechanism in the height direction of the supporting platform is adjusted according to the h