The invention is applicable to the technical field of automatic processing machinery and discloses an execution mechanism of a multi-station automatic polishing machine. An execution component comprises a part to be polished, a part base driving the part to be polished to move, a part limiting frame making the part to be polished be fixed to the part base, a part ejection component and a part clamping component. The part base is fixedly connected with a nut base. The part base is provided with an opening. The part limiting frame is arranged outside the opening. The part ejection component is arranged in the part base. According to the execution mechanism of the multi-station automatic polishing machine, the part base capable of moving in a reciprocating mode is adopted for driving the part to be polished to move, and thus after one side face of the part to be polished is polished, the other side face of the part to be polished can be polished automatically; meanwhile, the polishing procedure of the next part can be started through the part base, thus, the parts produced after the polishing procedure can be obtained only through one production line, and production efficiency is greatly improved.