Optical imaging observation device for internal form of in-service low-temperature LNG storage tank

The invention discloses an in-service low-temperature LNG storage tank internal form optical imaging observation device, and relates to the technical field of natural gas observation. The device comprises an LNG storage tank, a ball valve is arranged on the upper side of the LNG storage tank, a first connecting pipe is arranged at one end of the ball valve, one end of the first connecting pipe is in threaded connection with a second connecting pipe, and an observation device is arranged at one end of the second connecting pipe; the observation device comprises a sealing box, a fixing box is arranged on one side of the sealing box, the sealing box is fixedly connected with the second connecting pipe, a composite pipe is arranged in the fixing box in a transmission fit mode, camera shooting equipment and lighting equipment are arranged at one end of the composite pipe, and a cable device fixedly connected with the camera shooting equipment and the lighting equipment is arranged in the fixing box. By arranging t