The invention relates to the technical field of water channels, in particular to a water-saving irrigation water channel. The water-saving irrigation water channel comprises an open channel main body and a closed channel main body, an inverted-U-shaped frame is arranged above the end portion of the open channel main body, an outer frame body is arranged on the end portions of the open channel main body and the closed channel main body, an interception net is arranged on the inner side of the outer frame body, the interception net is of a vertical grid structure, a scraper is arranged on the outer side of the interception net, and the upper end of the scraper is movably connected on the inverted-U-shaped frame through steel wire ropes. An airtight door is arranged below the inverted-U-shaped frame, a round of door frame is fixed on the end portion of the closed channel main body, and the airtight door is slidably connected on the door frame. A screw rod is fixed in the middle of the upper end of the airtight door, a fixed seat is fixed in the middle of the inverted-U-shaped frame, an adjusting head is rotatably connected to the fixed seat, a threaded hole is formed in the adjusting head, the upper end of the screw rod is connected in the threaded hole in a threaded mode, and limiting mechanisms are further arranged on the two sides of the screw rod. The water-saving irrigation water channel is provided with two modes of an open channel and an closed channel, and meanwhile, a pollutant interception structure is additionally mounted at the end portion of the water channel, and the whole design of the water channel is convenient and energy-saving.