The invention relates to a preparation method and application of a recyclable silicone heating bag; the method comprises the steps of preparing silicone rubber and plastic film, wherein the thermal deformation of temperature of the plastic film is higher than vulcanization temperature of the silicone rubber; two sides of the plastic film are covered with the silicone rubber; the silicone rubber covering two sides of the plastic film are vulcanized, forming a silicone bag with an injection port; the plastic film is removed from the silicone bag; an elastic element is placed into the silicone element from the injection port, sodium acetate solution that is saturated at room temperature, and the elastic element is soaked in the sodium acetate solution; the silicone bag is vacuumized, and the injection port is sealed. The preparation method herein is simple and applicable to large-scale production. The recyclable silicone heating bag herein is convenient to use and carry, is recyclable, and applicable to heating eye masks, heating facial masks, heating insoles, and heating dysmenorrhea patches.