A multi-filtration auto-drainage/irrigation pipe includes a pipe body, which includes a first drainage and irrigation channel, a second drainage and irrigation channel, a third drainage and irrigation channel, a first drainage and irrigation port, a second drainage and irrigation port and a third drainage and irrigation port. The first drainage and irrigation port is a first filtering layer having first filtering holes uniformly distributed. The second drainage and irrigation port is a second filtering layer having second filtering holes uniformly distributed. The third drainage and irrigation port is a third filtering layer having third filtering holes uniformly distributed. The first drainage and irrigation port is arranged on a pipe wall of the pipe body. The second drainage and irrigation port is arranged between the second and the third drainage and irrigation channels. The third drainage and irrigation port is arranged between the second and the first drainage and irrigation channels. When draining, water flows through the first filtering layer, the second filtering layer, the third filtering layer and the first drainage and irrigation channel, and then is discharged. When irrigating, water flows through the first drainage and irrigation channel, the third filtering layer, the second filtering layer and the first filtering layer, and then is discharged.
