The invention discloses a pipeline type unmanned operation automatic water inlet and drainage device, which includes a pressure large pipe, a leather valve is installed in the middle of the pressure large pipe, pulling ropes are arranged on the left and right sides of the leather valve correspondingly, a water pipe is arranged at the bottom of the pressure large pipe, a water blocking valve blockis installed on the middle position of the water pipe, rope grooves are formed in the positions, near both ends, of the pressure large pipe and the water pipe correspondingly, and the pulling ropes penetrate through the rope grooves and are connected with the leather valve and the water blocking valve block correspondingly; and a return spring is installed on the right side position in the water pipe, and the two ends of the return spring are connected with the right end in the water pipe and the water blocking valve block correspondingly. According to the pipeline type unmanned operation automatic water inlet and drainage device, structure setting is ingenious, the layout is reasonable, automatic control is achieved through the water pressure, structure design is ingenious and simple, thecost is low, maintenance is easy, especially during inconvenient use of electricity or electric wire laying, the problem that traditional solenoid valves or related electrical equipment cannot work without power is solved, and the flexibility is greatly improved.