Adjustable spray irrigation device

The invention discloses an adjustable spray irrigation device which comprises an outer pipe and an inner pipe, wherein the outer pipe is configured to be a hollow pipe with a cavity inside; the spray irrigation device further comprises a water inlet pipe group, wherein the water inlet pipe group communicates with the cavity of the outer pipe and conveys water into the cavity; the inner pipe is controlled to ascend and descend through water pressure in the cavity; a water inlet is formed in the lower end of the inner pipe, and a spray head is mounted at the upper end of the inner pipe; and the outer pipe, the inner pipe, the spray head and the water inlet pipe group are all made of PVC. According to the spray irrigation device, lifting of the inner pipe is controlled through the water pressure of the water inlet pipe group, the height of the inner pipe is adjusted according to the height of crops so that the spray irrigation requirements of different crops can be met, all pipelines are made of PVC, the phenome