The invention provides a greenhouse irrigated by recovered rainwater and snow. The greenhouse comprises a greenhouse body, a scraper, a rainwater and snow collection well and collection tanks. The top of the greenhouse body is provided with a fixed plate in the axial direction. The fixed plate can move back and forth along the guide rail on the top of the greenhouse body. The scraper is driven to move by a motor arranged at one end of the scraper. The collection tanks are fixedly mounted at both the two sides of the greenhouse body. The tail end of each collection tank is provided with a push plate driven by a linear actuator. The push plates can scrape accumulated snow in the tanks into the rainwater and snow collection well. A gantry support is arranged inside the greenhouse in the axial direction. The top of the gantry support is provided with a plurality of support rods provided with a plurality of slidable nozzles, thus, precise irrigation can be achieved, and the yield of crops can be increased. According to the greenhouse irrigated by the recovered rainwater and snow, the rainwater and snow can be effectively recovered to carry out irrigation, and water resources are saved. Besides, a heating device in the well can melt ice cubes, and therefore irrigation is not influenced.