The present invention discloses a water-saving micro-irrigation device, comprising a water supply pipe, a plurality of micro-irrigation nozzles mounted on the water supply pipe, the micro-irrigation nozzle comprising an outer sleeve fixed on the water supply pipe, an inner sleeve slidably engaged within the outer sleeve, an inner side of a bottom of the outer sleeve being provided with a sealing ring in contact with the inner sleeve, an outer side of the bottom of the outer sleeve being provided with a bracket, an outer side of the inner sleeve being connected to the bracket by a spring, a side wall of the inner sleeve being provided with a plurality of through holes, a bottom of the inner sleeve being threadingly connected to a cover plate, and the cover plate being provided with a plurality of capillary holes. The present invention can improve the deficiencies of the prior art, is not easy to block, and can flexibly adjust the micro-irrigation coverage.