Shaft leak testing device for coiled tubing drilling

The utility model discloses a shaft leak testing device for coiled tubing drilling. The shaft leak testing device comprises an underground leak finding pup joint and a coiled tubing. At the tail end of the coiled tubing, the underground leak finding pup joint is connected with other underground devices. The underground leak finding pup joint comprises a pup joint body, at least one sensor set, a circuit system and an RFID label reading coil, wherein the RFID label reading coil is installed on the inner wall of the pup joint body and connected to the sensor sets through the circuit system, the sensor sets are used for acquiring corresponding parameters of the environment where the sensor sets are located, and the circuit system is used for controlling the sensor sets to be started and storing environment parameter data read by the sensor sets when the RFID label reading coil reads an RFID starting label carrying a starting instruction. The shaft leak testing device is easy to operate, high in reliability and low in cost.