A connecting structure, standard sections, a channel having the standard sections, and an irrigation system are provided. The standard sections 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 and a female buckle, or the two ends of the standard section are both provided with the male buckle or the female buckle. The male buckle comprises a male buckle connection plate. The female buckle comprises a female buckle connection plate having a U-shaped groove. Moreover, the thickness of the male buckle connection plate matches the width of the U-shaped groove, in order to prevent the male buckle connection plate from coming out of the U-shaped groove of the female buckle connection plate after being inserted therein.
