The invention relates to a semi-automatic electrode cap surfacing machine, and belongs to the processing machinery of spot welding electrodes. The semi-automatic electrode cap surfacing machine comprises a worktable, a pawl shaft driving mechanism, a rotary table, a rotary table shaft driving mechanism, a group of electrode cap pivotal supporting mechanisms, a power transmission mechanism and an automatic electrode cap driving mechanism, wherein a cylinder seat and a guide rail seat are fixedly arranged on the worktable, and one side of the cylinder seat forms a push rod abdicating cavity; the guide rail seat is positioned in a cylinder seat cavity, and a protective plate is arranged at the front side of the worktable; an electric control box is arranged at the left end of the protective plate, and the pawl shaft driving mechanism is arranged on the worktable; the rotary table shaft is fixedly arranged at the center of the rotary table, and the rotary table shaft driving mechanism is connected with the lower end of the rotary table shaft; the group of electrode cap pivotal supporting mechanisms are arranged around the edge part of the rotary table in the circumferential direction at intervals, and the power transmission mechanism and the automatic electrode cap driving mechanism are arranged on the worktable; and the power transmission mechanism comprises a motor support, a motor, a driving transmission wheel, a driven transmission axle, a driven transmission wheel and a conveyor belt. The semi-automatic electrode cap surfacing machine has the advantages of simple structure, low work intensity, ideal automation effect, reduction in human input, and low labor cost, and ensures the movement effect of the electrode cap pivotal supporting mechanism.