Full-automatic dimming detection equipment for a motorcycle headlamp comprises a workbench, a clamp device and a socket are arranged at the front part of the workbench, the clamp device comprises a bottom plate, the bottom plate is fixed on the workbench, a moving mechanism, a clamping mechanism and a lamp body profiling block are arranged on the bottom plate, the headlamp is arranged on the lamp body profiling block and is fastened by the clamping mechanism, and the lamp body profiling block is fixed on the workbench. A dimming screw is arranged in the headlamp, an adjusting sleeve is arranged on the moving mechanism and matched with the dimming screw, a detection frame is arranged on the rear portion of the workbench, a Fresnel lens is arranged in a front side plate of the detection frame, an image collector is arranged on the front side plate of the detection frame, and a projection plate is arranged on a rear side plate of the detection frame. The top of the detection frame is provided with a display and a PLC controller, a power supply frame is arranged below the workbench, a power supply is arranged in the power supply frame, the power supply is connected with an image collector, a socket, the display and the PLC controller, and during working, the headlamp is connected with the socket, and the headlamp is lightened to irradiate towards the Fresnel lens.