Abstract: A convection type discharge-irrigation pipe comprises an outer pipe, an inner pipe and a joint. The inner pipe is disposed in the outer pipe. Between the inner and outer pipes is defined outer discharge-irrigation channels, and an inner discharge-irrigation channel is defined in the inner pipe which can be triangle-shaped or rectangle-shaped in cross section. In a bottom of the outer pipe is defined a plurality of apertures. In both lateral surfaces and a bottom of the inner pipe is defined a plurality of apertures. The apertures defined in the lateral surfaces of the inner pipe enable the inner discharge-irrigation channel to be in communication with the outer discharge-irrigation channels. The apertures in the bottom of the inner pipe are aligned with the apertures in the bottom of the outer pipe. Thereby, such a discharge-irrigation pipe has the double function of discharging and irrigating water.