The present invention relates to a device for opening and closing a ventilator of a vinyl greenhouse which facilitates maintenance by preventing a load applied on a motor and automatically controlling. An existing ventilator for a vinyl greenhouse has a problem that an operator fixates a string by pulling the string or releases the string by himself or herself for opening or closing a cover. To solve this problem, the device for opening and closing a ventilator of a vinyl greenhouse of the present invention includes: vertically-moving wires of which first ends are fixed to covers of the ventilators installed on the upper part of the vinyl greenhouse and second ends are fixed to horizontally-moving wires installed in the longitudinal direction of the vinyl greenhouse. The horizontally-moving wires are connected to a tension spring and fixed to a rotary shaft to be moved or returned by a motor which rotates forward and backward according to control signals of a control unit. The vertically-moving wire is connected to a tension spring and moved or returned along a roller which rotates. Therefore, the present invention can prevent a load applied on the motor by always maintaining constant tension as the tension springs are connected； and can manage the vinyl greenhouse by an unmanned system by automatically controlling the motor according to the indoor temperature of the vinyl greenhouse sensed by a temperature sensor unit. Furthermore, the present invention can be manufactured and installed at low costs and can be easily operated as a configuration of the device is simple.본 발명은 모터에 가해지는 부하를 방지하고 자동으로 제어함으로써 유지관리가 더욱 용이한 비닐하우스의 환기구 개폐장치에 관한 것이다.종래의 비닐하우스용 환기구는 뚜껑을 개폐하기 위하여 작업자가 직접 줄을 잡아당겨 고정하거나 다시 풀어야 하는 문제점이 있는데, 이를 해결하기 위하여 본 발명은 비닐하우스의 상측에 복수로 설치된 환기구의 커버에는 상하이동와이어의 일단이 고정되며, 상기 상하이동와이어의 타단은 비닐하우스의 길이방향으로 설치된 좌우이동와이어에 고정된 비닐하우스의 환기구 개폐장치에 있어서, 상기 좌우이동와이어는 인장스프링이 연결되어 제어부의 제어신호에 따라 정·역회전하는 모터에 의해 이동 또는 복귀할 수 있도록 회전축에 고정되며, 상기 상하이동와이어에는 인장스프링이 연결되어 회전하는 롤러를 따라 이동 또는
