Lamp capable of replacing light distribution type without tool and implementation method thereof

The lamp comprises an outer shell, a light source cavity is formed in the outer shell, a light source plate is installed in the light source cavity, a lens is arranged below the light source plate, a face frame is arranged below the light source cavity, a plurality of pin shafts are arranged on one side of the face frame, and the pin shafts are rotationally connected with the outer shell. A plurality of connecting blocks are arranged on the other side of the face frame, limiting grooves are formed in the connecting blocks, buckles corresponding to the connecting blocks are hinged to the outer shell, and protruding blocks corresponding to the limiting grooves are connected to the buckles; the invention further discloses an implementation method of the lamp capable of replacing the light distribution type without the tool. The lens is fixed to the outer shell through the face frame, one end of the face frame is hinged to the outer shell through the pin shaft, the other end of the face frame is connected with th