It integrates ultra-high pressure water rust removal and cleaning technology, sewage recycling technology and wall-climbing robots. The wall-climbing robot is equipped with a cleaning plate for ultra-high pressure water rust removal, and the waste water and residue are vacuumed to prevent the wall from returning rust. In the whole process, there is no need to build scaffolding, which saves cleaning time and cost, and the operation is safe and reliable. It can truly achieve green, efficient and high-quality rust removal and cleaning. The core robot adopts an explosion-proof design, which is suitable for green rust removal and cleaning operations on the inner and outer walls of petrochemical storage tanks in an explosive environment in Zone II.