Anti-explosion LNG thermal insulation tank

The invention discloses an anti-explosion LNG thermal insulation tank. The anti-explosion LNG thermal insulation tank aims to solve the problems that after LNG cold preservation tanks are leaked, explosion is easily caused, and the human body and the property are greatly damaged. The anti-explosion LNG thermal insulation tank comprises a cold preservation tank body and an installation table, a buffer cylinder and a closed cylinder are sequentially arranged on the outer side of the cold preservation tank body, a plurality of air holes are formed in the side wall of the buffer cylinder, S-shaped rotating blades are rotatably connected in the air holes, the upper half parts of the rotating blades protrude inwards in an arc mode, the ends of the upper half parts of the rotating blades are close to the inner edges of the upper ends of the air holes, the lower half parts of the rotating blades protrude outwards in an arc mode, the ends of the lower half parts of the rotating blades are close to the outer edges of the lower ends of the air holes, the lower end of the closed cylinder is tightly connected with an exhaust pipe, an exhaust hole communicating with the exhaust pipe is formed in the lower end of the closed cylinder, a sealing disc covers the lower end of the closed cylinder and tightly covers the outer end of the exhaust hole, a pull spring is connected between the sealing disc and the lower end of the buffer cylinder, a buffer pit is formed in the ground below the installation table, the lower end of the exhaust pipe extends to the bottom of the buffer pit, and buffer branches are buried in the buffer pit.