Detection device and detection method for interior of pipeline

The invention relates to a detection device and a detection method for the interior of a pipeline, belonging to the field of petroleum. The detection device for the interior of the pipeline comprisesa walking mechanism capable of walking in a to-be-detected pipeline and a detection mechanism used for pipeline detection; and the detection device also comprises a PID speed control module used for controlling the walking speed of the walking mechanism and a speed detection module used for detecting the walking speed of the walking mechanism, wherein the speed detection module is connected with the signal of the PID speed control module which is connected with the walking mechanism in a controlled manner. When in use, the detection device is mounted into the to-be-detected pipeline, and the speed detection module detects the walking speed of the detection device in real time in the walking process of the detection device; the speed detection module transmits a measured speed to the PID speed control module, while