The invention discloses a self-filtering negative-pressure irrigation device. The self-filtering negative-pressure irrigation device comprises a water source container, an air collection cylinder is arranged nearby the water source container, the bottom opening of the air collection cylinder is connected with a filter cartridge through a sealing gasket and a clamp, a water outlet pipe is led out of the bottom of one side of the filter cartridge, the outer end of the water outlet pipe is connected with a plurality of connection pipes in parallel, each connection pipe is provided with at least two negative-pressure water feeders, a water suction pipe is connected between the upper side of the filter cartridge and the water source container and provided with an electromagnetic control valve, and a top cover of the air collection cylinder is provided with a negative-pressure switch and an air suction pipe respectively. According to the self-filtering negative-pressure irrigation device, water lower than the negative-pressure water feeders is supplied to roots of plants under the action of an atmospheric pressure difference by controlling negative pressure of the air collection cylinder, accurate control of the soil water content and continuous water supply are achieved, the water saving effect is good, manpower is saved, and the self-filtering negative-pressure irrigation device has wide application prospect.