The utility model provides a pipeline detector launching device which can launch the pipeline detector into the pipeline from the pig launcher, relates to the pipeline system technology filed. The utility model consists of a hydraulic cylinder (1) , a guide pipe (3), a carrier rod (4), a carrier plate (5), elevator frames (2), a tensing combination piece (6) , a push-and-pull rod1 (7), a push-and-pull rod sleeve (8), and a push-and-pull rod2 (9). The hydraulic cylinder (1) is fixed on one end of the carrier plate (5) with elevator frames (2) on the four corners; the other end of the carrier plate (5) is connected with the tensing combination piece (6). After being coated with the guide pipe (3), the carrier rod (4) matching the connecting ring of the output shaft head of the hydraulic cylinder (1) is connected by a pin (10). The guide pipe (3) is connected with a disc. The utility model ensures that the detector can be launched safely and reliably; the operation and control are simple, easy, and labor saving.