Cast-in-place pile top reserved steel bar protection device

The utility model relates to the technical field of building pile foundation construction equipment, in particular to a cast-in-place pile top reserved steel bar protection device which comprises an isolation pipe, a flow stopping petal and a cable tie. A cable tie is arranged on a pipe body of the isolation pipe, the upper end of the isolation pipe is sealed, a flow stopping petal is arranged at the lower end of the isolation pipe, the lower end of the isolation pipe is arranged on the reserved steel bar in a sleeving mode, and a sealing structure is formed between the lower end of the isolation pipe and the reserved steel bar through the flow stopping petal. According to the utility model, the reserved reinforcing steel bar can be effectively protected, concrete slurry can be prevented from permeating into the isolation pipe, the strength is prevented from being influenced by corrosion after the reinforcing steel bar is polluted, and the isolation pipe can be effectively prevented from floating upwards due