The invention discloses a pipeline installing device in the technical field of mechanical installation. The pipeline installing device comprises a base plate, wherein a gate-shaped frame body is fixed to the base plate, a groove is formed in the inner side of the frame body in the vertical direction, an upper clamping plate and a lower clamping plate are arranged on the inner side of the frame body and are arc-shaped, rollers are arranged at two ends of the upper clamping plate and are connected in the groove in a rolling mode, the upper clamping plate is connected to the top of the frame body through a spring, a traction rope is further connected to the upper clamping plate, a hand wheel is arranged at the top of the frame body, a traction roper penetrates through the top of the frame body and is wound around the hand wheel. The lower clamping plate is fixedly connected to the base plate, a supporting rod is connected between the lower clamping plate and the base, the upper clamping plate and the lower clamping plate are arranged in a mirror symmetry mode, a round cavity for containing a pipeline is formed between the upper clamping plate and the lower clamping plate, and a fastener for fixing the upper clamping plate and the lower clamping plate is further arranged between the upper clamping plate and the lower clamping plate. By adoption of the pipeline installing device, operation is convenient, the pipeline can be firmly fixed, the pipeline does not rotate or slide, and the stability of the pipeline is good.