Disclosed are a connecting structure, standard sections, a channel having the standard sections, and an irrigation system. The standard sections (1a, 1b, 1c, 1d, 1e) each comprise a bottom plate and side plates fixedly connected to both sides of the bottom plate; the three plates form a standard section body in a groove structure. Two ends of the standard section are respectively provided with a male buckle (3) and a female buckle (2), or the two ends of the standard section are both provided with the male buckle (3) or the female buckle (2). The male buckle (3) comprises a male buckle connection plate (31). The female buckle (2) comprises a female buckle connection plate (21) having a U-shaped groove. Moreover, the thickness of the male buckle connection plate (31) matches the width of the U-shaped groove, in order to prevent the male buckle connection plate (31) from coming out of the U-shaped groove of the female buckle connection plate (21) after being inserted therein. Channels (100, 100') are formed by
