The invention discloses a sliding block reversing jet flow tee joint and pulse micro-irrigation system, and belongs to the technical field of agricultural irrigation, the sliding block reversing jet flow tee joint and pulse micro-irrigation system comprises a water pump, a fertilizing device, a filtering device, a main pipe, branch pipes, capillary pipes, jet flow pulse tee joints, capillary pipe joints, drippers, valves, branch pipe joints and main pipe joints; pressure water flow enters the jet space through the jet pipe to form jet, and the wall attachment effect is generated. A sliding block air pressure reversing device is arranged, the atmospheric pressure acting direction is periodically changed, and the jet flow direction is periodically and alternately changed. The jet flows are switched and flow in the jet flow pulse tee joint according to a certain frequency, pulse water flow is generated and enters a pipeline of the micro-irrigation system, strong turbulent fluctuation and impact water flow are formed in the irrigation emitter, and the anti-blocking capacity and the irrigation uniformity of the micro-irrigation system are enhanced. The jet pulse tee joint is more stable in jet reversing, pulse parameters can be designed according to needs, and the jet pulse tee joint is simple and reliable in structure, high in durability, convenient to machine and low in manufacturing cost.