Anti-blocking device for municipal road drainage

The invention relates to the technical field of municipal drainage, in particular to an anti-blocking device for municipal road drainage. The anti-blocking device comprises a water inlet pipe, a water outlet pipe, a filter residue collecting assembly and a filtering assembly, wherein the filter residue collecting assembly has a dirt collecting pipe and a guide pipe; the dirt collecting pipe is connected to the lower end of the water inlet pipe; the filtering assembly comprises an upper filter screen, a lower filter screen and an elastic part, the outer edges of the upper filter screen and the lower filter screen are connected with the inner circumferential wall of the water inlet pipe, and the elastic part is sleeved at the upper end of the guide pipe in an up-down sliding manner; the guide pipe is sleeved with a pressure spring, and the pressure spring drives the elastic part to move upwards to a position above the residue inlet in the initial state; and the middle parts of the upper filter screen and the lo