The present invention relates to a prefabricated greenhouse which is mostly installed on the ground such as concrete, asphalt, etc. to allow users to cultivate various vegetables personally. The prefabricated greenhouse comprises: a greenhouse having a greenhouse structure formed by vertically and horizontally installing greenhouse frames to be able to be disassembled, a transparent film placed on the outer part of the greenhouse structure, and an opening and closing window installed on both sides of the middle of an upper roof of the greenhouse structure in the longitudinal direction of the greenhouse structure to be opened and closed by an opening and closing means a plant cultivating means having multilayered plant cultivation frames arranged on one side or both sides of the inner part of the greenhouse in the longitudinal direction of the greenhouse to cultivate plants in a state of being filled with plant cultivating soil, and having a water storage part arranged on the lower part of each plant cultivation frame to supply water to the plant cultivating soil a water supply means having a water level sensing means installed on the water storage part to sense the level of water in the water storage part, a water supply hose which has water supply holes formed at regular intervals and is arranged on each plant cultivation frame filled with the plant cultivating soil, and a pump installed on the water supply hose to pump the water in the water storage part and a side ventilation part having extended frames installed at regular intervals integrally with the greenhouse in the longitudinal direction of both sides of the greenhouse, and having a transparent plastic placed on the extended frames installed at regular intervals to be vertically opened and closed by an opening and closing means.COPYRIGHT KIPO 2016본 발명은 주로 콘크리트 또는 아스필트 등의 지면에 설치하여 각종 채소를 손수 재배할 수 있도록 한 조립식 온실에 관한 것으로 그 구성은, 온실프레임을 종/횡방향으로 분해조립 가능하게 설치하여 온실골격을 마련하고, 그 온실골격의 외부에 투명필름을 씌워 설치하며, 상기 온실골격의 상부 지붕의
