The invention provides an intelligent agricultural greenhouse irrigation system. The system comprises a control room, a photovoltaic power supply device, a control device, a water tank one-way valve,a spraying valve, a pesticide supply device, a water supply pump, a water storage tank, a filtering device, a water injection pipe, an irrigation valve, a water level monitoring device, an irrigationpipe, spraying openings, a greenhouse detector, a roof, a water pipe, water pressure switches, a roof supporting column and a water collecting tank, wherein the water storage tank is buried in the soil at the lower part of the greenhouse, and the water supply pump is arranged at the left lower part of the inner side of the water storage tank. According to the invention, with the arrangement of a filter screen, impurities in the rainwater collecting work can be filtered out, and the water pipe is prevented from being blocked during irrigation, so that the maintenance is simple and convenient; with the arrangement of an adsorption layer, the collected rainwater can be physically adsorbed, and peculiar smell in the water can be removed; and with the arrangement of an end cover and a base, thedisassembly of the filtering device is facilitated, and the internal cleaning for preventing blocking is facilitated. The intelligent agricultural greenhouse irrigation system is more convenient to use, and is convenient for popularization and use.