Parasite expelling device for greenhouse and control method

The invention provides a parasite expelling device for a greenhouse and a control method. The device is characterized by comprising a shell, an ultrasonic loudspeaker, a control circuit board and a storage battery which are arranged inside the shell, a solar panel arranged at the top of the shell and an insertion rod arranged at the bottom of the shell; the control circuit board comprises a control unit and an ultrasonic oscillator which are connected; the control circuit board is connected with the ultrasonic loudspeaker, the storage battery and the solar panel; an ultrasonic loudspeaker transmission window is arranged on the shell. According to the preferential scheme, the device is simple in structure and high in practicability, the ultrasonic technology is introduced for vegetable insect pest expelling, the generality is achieved, various parasites can be expelled by transmitting different ultrasonic frequencies, the effect is good, the device is environmentally friendly, and the device is of a great sign