The invention relates to a rotary blanking mechanism for cylinder body circumferential notches. The rotary blanking mechanism for the cylinder body circumferential notches comprises a workbench, a servo motor, a positioning sleeve, a male die and a female die, wherein the servo motor and the positioning sleeve are installed on the workbench, and the male die and the female die are arranged in pairs. The female die is a cylinder, a through groove matched with the male die is formed in the circumferential wall of the female die, the width of the through groove is greater than or equal to the width of the male die, the width of the male die is less than or equal to the width of the smallest notch of the cylinder body, the positioning sleeve positions the cylindrical body of the notch to be cut, the positioning sleeve is connected with the servo motor, and the servo motor drives the cylinder body to rotate around the axis of the female die through the positioning sleeve. The rotary blanking mechanism for the cylinder body circumferential notches has the following advantages that one end of the cylinder body is installed in the positioning sleeve, and the other end of the cylinder bodyis clamped into the female die. When the male die processes one notch of the cylinder body, the cylinder body is rotated by the servo motor, and the next notch is processed, and so on the whole notches are processed without the need for technical workers to be on duty, and the work efficiency is high.