The invention discloses a car side window and rearview mirror rain-removing and defrosting device and a control system thereof. The car side window and rearview mirror rain-removing and defrosting device comprises a rearview mirror body, a lens gas ejecting mechanism, a side window gas ejecting mechanism and a gas pump; the rearview mirror body comprises a shell, a lens and a mounting frame; the lens is mounted on the shell, one end of the mounting frame is connected with the shell, and the other end of the mounting frame is connected with a car body; the lens gas ejecting mechanism is mountedon the shell, located on the outer side of the lens and used for allowing gas to be ejected and acted on the surface of the lens; the side window gas ejecting mechanism is arranged on the mounting frame and located at the end, connected with the car body, of the mounting frame, and the side window gas ejecting mechanism is used for allowing gas to be ejected and acted on the car body side window;and the gas pump is arranged in the car body and communicates with the lens gas ejecting mechanism and the side window gas ejecting mechanism through air pipes. According to the car side window and rearview mirror rain-removing and defrosting device, a driver can clearly see an outer rearview mirror, and the situation that the field of view of the driver is blocked by objects is avoided; and by matching with a control system, the efficient rain-removing and defrosting effect is achieved, and energy is saved.