Abstract: A semiconductor ceramic heater and a design method therefor. The design method includes: establishing a length expression for each turn of a heating wire of the semiconductor ceramic heater, thereby determining an expression of thermal energy generated by each turn of the heating wire; establishing an area expression for each region of a ceramic disc partitioned by the heating wire; determining a thermal energy model allocated to each region according to the area expression and the expression of the thermal energy; determining a radiative heat release quantity model of each region according to the area expression and a target temperature of each region; and calculating the radius of each turn of the heating wire and the thermal energy required to reach the target temperature by combining the thermal energy model and the radiative heat release quantity model.