The invention relates to the field of liquid crystal display television equipment, in particular to an automatic fire extinguishing system for a liquid crystal display television. The automatic fire extinguishing system comprises a television shell, a liquid crystal screen module and a circuit module. The television shell and the liquid crystal screen module are connected in a matched manner. The circuit module is arranged in a space formed by the television shell and the liquid crystal screen module. Vent holes are formed in the television shell. A snap-through type double-metal-sheet temperature controller, a baffle, a connecting rod, a torsion spring, a limiting and buckling mechanism and a hopping connecting rod are arranged in the space formed by the television shell and the liquid crystal screen module. The snap-through type double-metal-sheet temperature controller is driven by the hopping connecting rod and the connecting rod, the limiting and buckling mechanism loses the limit to the baffle, and the vent holes can be covered with the baffle under the effect of the torsion spring. The automatic fire extinguishing system for the liquid crystal display television is simple in structure and high in safety.