Constant-temperature ventilation device for greenhouse

The utility model discloses a constant-temperature ventilation device for a greenhouse. The greenhouse comprises a base, a greenhouse body and a servo motor, mounting openings are formed in the two sides of the greenhouse body, ventilation plates are rotatably connected to the tops in the mounting openings through hinges, a mounting cover is fixedly connected to the upper side of the greenhouse body, and a main transmission shaft and two symmetrically-arranged auxiliary transmission shafts are connected into the mounting cover through a transmission mechanism. According to the utility model, the transmission mechanism is matched with the connecting mechanism; therefore, the traction rope can be connected with the ventilation plate; at the moment, the servo motor rotates to drive the main bevel gear to rotate; the main bevel gear rotates to drive the auxiliary bevel gear to rotate; the auxiliary bevel gear rotates to drive the auxiliary transmission shaft to rotate, the auxiliary transmission shaft rotates to