The invention discloses a double-pipe type shield tail grouting device. The device comprises a main pipe, an auxiliary pipe, a main end cover, an auxiliary end cover, a long rod and a connecting rod.The main pipe and the auxiliary pipe are both installed at the shield tail of a shield tunneling machine, and the main pipe and the auxiliary pipe are parallel. The auxiliary end cover covers the pipetail of the auxiliary pipe, the main end cover is coaxial with the main pipe, the two ends of the connecting rod are connected with the side face of the main end cover and the side face of the auxiliary end cover respectively, and the main end cover and the auxiliary end cover are located on the same plane. The long rod is located in the auxiliary pipe and is coaxial with the auxiliary pipe, a first end of the long rod goes beyond the pipe head of the auxiliary pipe, a second end of the long rod is fixedly connected with the auxiliary end cover, and the long rod can drive the auxiliary end cover to rotate. According to the double-pipe type shield tail grouting device, the long rod is arranged in the auxiliary pipe, and a constructor rotates the auxiliary end cover and the main end cover by using the long rod, so that the main end cover can be controlled to close the pipe tail of the main pipe, slurry is prevented from flowing back to the main pipe during shutdown of the shield tunneling machine, the main pipe has higher anti-blocking capability, and the service life of the main pipe is prolonged.