Water-saving channel for farmland irrigation

The utility model discloses a water-saving channel for farm irrigation, which comprises a bottom plate, side boxes are fixed on the two sides of the top wall of the bottom plate, a U-shaped water-saving channel main body is movably arranged on the middle section of the bottom wall of the bottom plate, and the outer side walls, close to each other, of the two side boxes are respectively contacted with the outer side walls of the two sides of the water-saving channel main body. Horizontal supporting plates are fixed to the top ends of the side walls of the two sides of the water-saving channel body correspondingly, the bottom walls of the supporting plates make contact with the outer top walls of the side boxes, rectangular inserting holes are formed in the top walls, close to each other, of the two side boxes correspondingly, inserting blocks are fixed to the side ends, away from each other, of the two supporting plates correspondingly, and the two inserting blocks are movably arranged in the two inserting hol