The invention discloses a jet overflow dyeing machine nozzle, comprising a nozzle carrier and a nozzle core carrier and a nozzle cover which are arranged in the nozzle carrier; wherein the nozzle core carrier and the nozzle cover are in funnel shape, the lower end of the nozzle cover is inserted into the nozzle core carrier, an annular gap is arranged between the nozzle core carrier and the nozzle cover, the annular gap is a dye liquor injecting port, the nozzle carrier is provided with a nozzle fluid pipe, the lower end of the nozzle core carrier is connected with the nozzle carrier by screwthread, a spacer is arranged between the lower end face of the nozzle core carrier and the nozzle carrier, and the outer wall of the nozzle core carrier is provided with a plurality of watertight shutters separated each other. The invention can prevent reflow from being produced in curved pipe of nozzle and reduce textile kinking and 'tympany'. When installing the nozzle, the thickness of the spacer between the nozzle carrier and the nozzle core carrier is adjusted to regulate the size of the dye liquor injecting port and the angle between the watertight shutter on the nozzle core carrier andthe nozzle fluid pipe, thus realizing regulation of liquid flow jet speed and pressure.