Closed siphon drainage channel

A closed siphon drainage channel relates to the technical field of drainage devices and is composed of a plurality of drainage channel bodies which are sequentially connected end to end, each drainage channel body comprises an inverted U-shaped groove, a bottom plate, a water inlet, a reinforcing component, a connecting mechanism and a protection mechanism, the bottom end of each U-shaped groove is fixedly connected with the upper surface of the corresponding bottom plate in a sealed mode, and the bottom end of each U-shaped groove is connected with the upper surface of the corresponding bottom plate in a sealed mode. The water inlets are formed in the bottoms of the two side walls of the U-shaped groove at intervals in the trend of the U-shaped groove, a reinforcing component is arranged on the outer surface of the U-shaped groove, a protection mechanism is further arranged on the outer surface of the side wall of the U-shaped groove above the water inlets, and the connecting mechanism comprises a first conn