Water-saving irrigation system for greenhouse

The invention discloses a water-saving irrigation system for a greenhouse, which comprises a water tank, a telescopic pipe, a four-way connector, three transverse pipes, two transverse strips, a lifting mechanism, two water storage tanks and two guide pipes, wherein the water tank is fixedly connected with the telescopic pipe, the top end of the telescopic pipe is fixedly connected with the four-way connector, the three transverse pipes are fixedly connected with the four-way connector, the two transverse strips are fixedly connected with the three transverse pipes, the lifting mechanism is located between the two transverse strips, and the two water tanks communicate with the water tank through the two guide pipes respectively. By controlling the distance between irrigation nozzles and plants, the water-saving irrigation system does not affect flowers during irrigation, does not hinder advancing of farmers entering the greenhouse at other time, can collect rainwater for irrigation, and can carry out pesticid