The invention discloses a high-temperature atomizing heating device of an electrical steam box. The high-temperature atomizing heating device comprises a water supply box, a primary heater and a secondary heater, wherein the water supply box is connected with the primary heater through a medium transporting pipe I, and a water suction pump I is mounted on the medium transporting pipe I; the primary heater is connected with the secondary heater through a medium transporting pipe II; the air outlet of the secondary heater is connected with a medium transporting pipe IIII; the outlet of the medium transporting pipe III is mounted inside the inner cavity of the electrical steam box. After the structure is adopted, the phenomenon that food inside the electrical steam box is easy to be tainted by other odor and easy to change color is improved, and simultaneously the state that the food is cracked due to water storage on the surface and tasteless due to wetness and softness inside is solved,so that the steamed food is good in taste.