Abstract: A cooking appliance comprising a thermal insulation cavity assembly is described. The thermal insulation cavity assembly comprises an inner cavity assembly and an insulation frame assembly sequentially arranged, an insulation member is disposed between the inner cavity assembly and the insulation frame assembly to which it is snap-fitted, and the insulation frame assembly is connected to the inner cavity assembly. The cooking appliance provides thermal insulation and heat blocking functions to prevent heat in the oven cavity from being transferred to the electrical cavity, avoiding excessive heat dissipation load in the electrical cavity or excessively high temperature in the electrical cavity and high-temperature damage to electrical components, while concentrating heat in the oven cavity to ensure a good temperature rise rate in the oven cavity to enable relatively rapid attainment of the required cooking temperature.