A perforated subirrigation/drainage pipe includes a pipe body and a permeation irrigation inner pipe. The permeation irrigation inner pipe is integrally formed with the pipe body and disposed at a top of an interior of the pipe body along a central axis thereof; multiple irrigation perforations, distributed along a central axis of the permeation irrigation inner pipe, are provided on a pipe wall of the permeation irrigation inner pipe; and an opening is provided on a pipe wall of the pipe body; two flow guide baffles are respectively located at two sides of the opening and on an inner wall of the pipe body; a main irrigation and drainage channel is formed between each flow guide baffle and an outer wall of the permeation irrigation inner pipe, between each flow guide baffle and the inner wall of the pipe body, and between the two flow guide baffles.
