The invention relates to a slow seepage type root irrigation device. The slow seepage type root irrigation device comprises an anti-corrosion tank which is horizontally arranged, wherein the bottom of the anti-corrosion tank is clamped with the top of a supporting base which is vertically arranged on the ground; a plurality of liquid adding devices communicated with the anti-corrosion tank are arranged on the top of the anti-corrosion tank at intervals along a length direction of the anti-corrosion tank; a motor is vertically arranged on the top of the anti-corrosion tank between two adjacent liquid charging devices; water outlets are respectively formed in the two sides of the bottom of the side wall of the anti-corrosion tank; and a plurality of water supply pipes are uniformly arranged on diversion pipes along length directions of the diversion pipes and are respectively connected to diversion pipes. The slow seepage type root irrigation device has the beneficial effects that structural design is reasonable; as water seeps upwards from underground, water sources are saved while water is effectively absorbed by soil; the water consumption of the slow seepage type root irrigation device is only one tenth of the traditional irrigation water consumption; natural rainwater can be effectively collected; the root irrigation device adopts a gravity pressurization manner; power sources are not needed in the whole process; and once locust plague occurs, timely response can be realized, thereby preventing harm to vegetation.