The invention provides a pipeline internal inspection device. A detection assembly and a driving umbrella are fixedly connected to a connection pole, after the driving umbrella is opened, under the pushing of water flow, the driving umbrella drives the detection assembly and the connection pole move along the water flow, a cable assembly connects the detection assembly and a monitoring platform, the cable assembly reels and unreels a cable when the detection assembly moves along the water flow, and the detection assembly acquires the image and sound signals in the pipeline and sends the image and sound signals to the monitoring platform. The pipeline internal inspection device provided judges the faults through the combination of the video and audio data and has high accuracy; and the pipeline internal inspection device can rapidly find and position pipeline leakage or other faults, and can timely identify pipeline inner wall scaling and corrosion or other hidden troubles; and by means of the medium flow in the pipeline, a probe is driven by the umbrella device to move in the pipeline without additional energy, so that the design of a probe moving device is simplified.