The invention relates to the technical field of LED assembling and machining equipment, in particular to a biaxial suction type automatic lock screw feeder. The screw feeder comprises a machine frame and two triaxial moving assemblies arranged on the machine frame. Each triaxial moving assembly is provided with an electric screw driver, the lower portion of each triaxial moving assembly is provided with a clamp disc capable of rotating intermittently, and each clamp disc is provided with at least two workpiece clamps. In the lock screw machining process, equipment does not need to be shut down, loading, disassembling or replacement of workpieces can be achieved, and machining efficiency of the automatic lock screw feeder is greatly improved. In addition, the two triaxial moving assemblies carry out lock screw machining simultaneously, so that machining efficiency is further doubled, and practicability is high. The workpieces machined through the screw feeder can be mobile phone shells, tablet personal computer shells, navigator shells, routers, set top boxes and other electronic products.