The utility model relates to a micro irrigation constant-current tube fastener, which comprises a pipe joint body provided with a steady flow valve core in one end at least, the front end of the steady flow valve core faces an entering-water end, the rear end of the steady flow valve core is arranged on the pipe joint body, the periphery of the front end of the steady flow valve core and the inner wall of the pipe joint body form a steady flow chamber, the steady flow chamber is communicated with the flow passage of the pipe joint body and the flow passage of the steady flow valve core, and the steady flow valve core comprises a strut and an elastic equilibrium film. The utility model solves the problems of poor steady flow effect, high failure rate, unreliable performance, unable maintenance and higher cost of the existing current stabilizers. Simultaneously, the utility model can be used as a micro irrigation constant-current tube fastener of the micro irrigation tube coupling. The utility model can be suitable for the steady flow and the connection of various micro irrigation pipe lines.