The invention discloses a control device for rotation of a stepping motor. The device comprises a plurality of physical switches and trigger terminals for triggering the physical switches to act, theplurality of physical switches are connected to the power supply circuit of the stepping motor in parallel; the physical switches are distributed along the rotating periphery of the trigger terminal,the trigger terminal is arranged on the rotating shaft of the stepping motor and rotates synchronously along with the rotating shaft, the trigger terminal rotates by a certain angle to trigger the physical switches to be switched off, and the power supply circuit is switched off to achieve fixed-angle rotation of the stepping motor. According to the control device for rotation of the stepping motor, the physical switches are arranged at the position of the rotating periphery of the trigger terminal, and the rotation angle of the stepping motor is set, so that the stepping motor does not need to rotate by 180 degrees every time, the stepping motor rotates to different angles by rotating the rotation shaft of the stepping motor for strokes of different angles, and therefore, the change of awater path, an air path or other loads is achieved.