The invention discloses a fruit tree irrigation device, which comprises an environment monitoring device, an electromagnetic valve, a water accumulation pipe and a water delivery pipe. The environmentmonitoring device comprises a temperature-humidity sensor, a carbon dioxide sensor, an information processor, a solar battery pack, a driving module and an I/O (input/output) interface. The fruit tree irrigation device collects environmental state information of soil through various sensors and transmits the information to the information processor for processing, the information processor opensor closes the electromagnetic valve connected with water supply management according to preset parameters, water is supplied to the water accumulation pipe embedded in the soil, and the water permeates into the surrounding soil through water seepage holes formed in the pipe wall of the water accumulation pipe. By means of the mode above, automatic deep irrigation can be achieved, a large amount ofmanpower is saved, and water resources are saved.