The utility model discloses an anti-blocking device of a pollution-absorbing head. The anti-blocking device of the pollution-absorbing head comprises a power source, a power transmission device, a reel star wheel pack and a shell body. The reel star wheel pack comprises two groups of reel star wheels which are installed in parallel and close to each other or in a crossing and overlapping mode. The reel star wheels move in a rotating mode. The power transmission device transmits power simultaneously to the two groups of the reel star wheels after slowing down the power of the power source. The two groups of the reel star wheels rotate reversely outward and simultaneously. The reel star wheel pack is supported on the front wall and the back wall of the shell body, the bottom and the middle lower portions of two sides of the shell body are open, and a pollution-absorbing nozzle is arranged on the upper portion of the shell body and is connected with a pollution-absorbing device. The anti-blocking device of the pollution-absorbing head has the advantages of effectively preventing river sundry which possibly blocks a pollution-absorbing pipe from entering the pollution-absorbing pipe, and achieving continuous pollution-absorbing work of the pollution-absorbing pipe.