Precise measurement device for height of perlite of low-temperature LNG storage tank

The utility model discloses a device for accurately measuring the height of perlite of a low-temperature LNG (Liquefied Natural Gas) storage tank, and relates to the technical field of measuring devices. The device comprises an LNG storage tank, a concrete top plate is arranged on the LNG storage tank, a filling pipe is arranged on the upper side of the concrete top plate, and a ball valve is arranged on the filling pipe; transparent glass is arranged on the upper side of the ball valve, a gland is arranged on the transparent glass and connected with the ball valve, a notch is formed in the middle of the gland, and a laser range finder is arranged on the upper side of the notch. According to the utility model, through the arrangement of the transparent glass, the tank pressure in the LNG storage tank can be borne, and a user can measure the interior of the LNG storage tank through the arranged laser range finder, so that the distance of the surface of a perlite lens is measured, the height of perlite is calcu