Anti-backflow cleaning device suitable for underground diaphragm wall of trenching machine

The utility model relates to the technical field of trenching machines, in particular to an underground diaphragm wall anti-backflow cleaning device suitable for a trenching machine, the underground diaphragm wall anti-backflow cleaning device suitable for the trenching machine comprises a grab bucket connected to the trenching machine, the cleaning device comprises a plate body (210) and a shoveling piece, the shoveling piece is fixedly connected to the plate body (210), and the plate body (210) is fixedly connected to the grab bucket. The plate body (210) and the shoveling piece extend outwards from a connecting point, and a scraping piece is arranged on the plate body (210); the grab bucket is placed between the side wall 30C and the side wall 40D of the T-shaped connector groove in the figure 1, the plate body (210) is placed between the side wall 10A and the side wall 20B, then the scraping piece is made to abut against the side wall 10A, then the side wall 10A is cleaned along with the penetration of th