Flow guide device of bridge underwater pile foundation

The utility model relates to a diversion device of a bridge underwater pile foundation, which comprises a bridge pier foundation platform and a pile foundation body used for supporting the bridge pier foundation platform, and a foundation casing located on the lower portion of the pile foundation body and a diversion casing located above the foundation casing and fixedly connected with the foundation casing are sleeved on the periphery of the pile foundation body. The top of the flow guide protection cylinder is connected with a pier foundation platform, the lower end of the foundation protection cylinder extends to the lower portion of a riverbed, and a flow guide wing plate is fixed to the outer portion of the flow guide protection cylinder. According to the flow guide structure, erosion of water to the pile body is avoided, the problems of concrete peeling, rib exposure and the like caused by the fact that the water level changes out of the pile body and is eroded by the water can be avoided, and in additi