The utility model discloses a sewage treatment device with an anti-blocking function. The device comprises an outer shell and an inner shell, the outer shell and the inner shell are both of a bowl-shaped structure. Wherein the outer shell is concentrically arranged outside the inner shell in a sleeving mode, the inner shell and the outer shell are fixedly connected with an annular plate, an annular groove body is formed in the side wall of the inner shell, an annular filter screen is fixedly connected into the annular groove body, a power box is welded to the outer wall of the lower end of theinner shell, and a motor is fixedly connected into the power box through bolts. The sewage treatment device disclosed by the utility model can be used for effectively filtering wastes in sewage, onlyneeds to clean the wastes once at set intervals, avoids the situation that workers need to frequently clean the wastes, reduces human resources, can effectively work, reduces the cost, and enhances the treatment effect at the same time.