The invention provides a belt sander feeding system which is novel in structural design, high in safety and high in production efficiency. The belt sander feeding system comprise an abrasive belt for conducting polishing treatment on a workpiece, wherein the abrasive belt is longitudinally arranged and comprises a tool clamp for clamping the workpiece and a material table for the tool clamp to be put, the tool clamp is arranged on the material table, a supporting table is further arranged on the front side of the material table, a pushing plate for forwards pushing the tool clamp arranged on the supporting table is arranged on the left side of the supporting table, a machining platform is further arranged on the right side of the supporting table, and the tool clamp located on the supporting table can be pushed to the machining platform through the pushing plate, and a feeding mechanism for pushing the tool clamp arranged on the machining platform to be below the abrasive belt is further arranged on the machining platform.