Underground drainage pipeline cleaning and in-situ repairing device and operation method

The invention discloses an underground drainage pipeline cleaning and in-situ repairing device and an operation method. The system comprises three subsystems including a drainage pipeline system, a cleaning and repairing system and a power control system. In order to solve the prominent problems that obstacles deposited on an underground drainage pipeline are complex, damage is difficult to find out in time, and an effective in-situ cleaning and repairing device and method are lacked, the invention constructs a device for cleaning different types of pipeline obstacles, pipeline damage of different degrees and damage at different positions based on a variable cleaning device of the pipe diameter. The gas-water-repairing agent combined intelligent cleaning and repairing of the conditions such as silting and blocking in daily operation of the drainage pipeline system are achieved, and the pipeline cleaning accuracy, efficiency and durability are improved. Guarantee is provided for safe operation and function exe