Automatic window opening and closing device

The utility model relates to an automatic window opening and closing device. The system comprises a window opening and closing executing mechanism and a main control module, the window opening and closing executing mechanism comprises a linear guide rail, a circuit mounting box, a direct-current motor, a transmission mechanism and a limiting switch. The circuit mounting box, the direct current motor, the transmission mechanism and the limit switch are fixed on the linear guide rail through long pins, bolts, nuts and screws; the transmission mechanism comprises a gear, a flexible rack and a connecting rod; the flexible rack is matched with the gear, the connecting rod is connected with the flexible rack, the gear is connected with the direct-current motor, the two limiting switches are located at the front end and the tail end of the linear guide rail respectively, the flexible rack is fixed in a rail on the side face of the linear guide rail through a bolt and a nut, and the long pin is directly connected wit