In recent years,the construction and development of urban storage tanks have been rapid.In order to solve the problem of environmental detection in underground storage tanks,it was necessary to design a device that could automatically inspect inside the storage tank to detect the status of sewage and surrounding air.This article designed a rail mounted inspection vehicle,which prelayed a passive inspection track on the top of the regulating tank,built a wireless lo-cal area network inside the regulating tank,and automatically detected,recognized,and recorded the status data and corre-sponding coordinate positions of the water and air in the tank through industrial cameras and sensor detection technology,and displayed them in real-time on the upper computer operation platform.The inspection vehicle designed in this article achieves real-time collection of methane,acetylene,ammonia,oxygen concentration,temperature,humidity,liquid level height,sewage status judgment,position coordinates,and driving parameters,realizing automatic inspection function.The inspection speed was 0~1.5 m/s,the video stream capture frame rate was 25 fps,and the maximum image resolution could reach 1920×1080 dpi,convenient and fast detection of the environment inside the urban storage tank,warning users of po-tential safety hazards,and ensuring the safe and stable operation of the urban storage tank.