A spray system of a washing comprises a spray pipeline with one end being a water inlet and further comprises an air pressure communication device; and one side of the air pressure communication device communicates with the spray pipeline while the other side of the air pressure communication device communicates with an outer drum of the washing machine. The spray system has the advantage of simple structure. The outer drum of the washing machine can communicate with the spray pipeline by the air pressure communication device, the pressure of the outer drum of the washing machine is guaranteed to be the same as that of the spray pipeline, water in the spray pipeline can totally flow into the outer drum of the washing machine, and the problem of water dripping when a door is opened due to residual water in the spray pipeline is avoided.
