The invention provides a rotary plate type overflowing pipeline insect prevention device and belongs to the technical field of water supply and drainage devices. The rotary plate type overflowing pipeline insect prevention device comprises a body, a rotating device, a rotary plate and a reset device, wherein the rotary plate is placed at the outlet end of the body to block an outlet of the pipeline body, one end of the rotating device is fixed on the body, the other end of the rotating device is connected with the rotary plate which is provided with the reset device, and the rotary plate resets through the reset device. According to the rotary plate type overflowing pipeline insect prevention device, gravity reset or the spring reset device is used for driving the rotary plate to be closed, when water flow does not exist, the rotary plate and the pipeline body are tightly combined, mosquitoes, insects and animals of various sizes can be effectively prevented from entering a water tank or a water pool through an overflowing pipeline, water quality is prevented from being polluted, water passing performance is good, organized drainage is truly achieved, the structure is simple, and construction is convenient.