Electric heating step solid-liquid heat storage heating bag

The invention relates to an electric heating step solid-liquid heat storage heating bag. A cavity is arranged in a bag body, the cavity is connected with a water injection port, a sensible heat storage part, two latent heat storage parts and an electric heating component are arranged in the cavity to form step heat storage, a phase change material is arranged in each latent heat storage part, andthe electric heating component is formed by sequentially connecting an electric heating wire wound on the phase change material, an overtemperature fuse, a fuse packaged in a shell and a temperature control element packaged in a sealing piece. After the heat storage heating bag is charged, the electric heating assembly converts electric energy into heat energy, after the electric heating assemblyreaches a preset temperature, the phase change material with the phase change function absorbs heat and is sequentially changed from a solid state to a liquid state for heat storage so as to be used as a heat source for heatin