The invention relates to a pin bending machine, and particularly relates to a computer mainboard resistor pin bending machine. The computer mainboard resistor pin bending machine aims at achieving thetechnical purposes that resistor pins can be automatically bent, fingers cannot be punctured, the bending angles of all resistors can be consistent, and the bending speed is high. The computer mainboard resistor pin bending machine comprises a base, supporting plates and the like, wherein the supporting plates are welded to the front side and the rear side of the upper left part of the base; anda hollow cylinder can be driven to rotate through a gear motor, under contact cooperation of a fixed protrusion and a special-shaped sliding rod, a rubber clamping plate can be driven to clamp the resistors, then the special-shaped sliding rod jacks up a swing groove plate, the swing groove plate can drive the resistor pins to be bent by 90 degrees, through cooperation of a movable protrusion anda special-shaped contact rod, a pushing plate can be driven to push the resistors into special-shaped open holes, and resistor components can be prevented from being clamped in a discharging groove.