Multi-temperature-zone heating plate

The multi-temperature-zone heating disc comprises a heat storage plate, an upper mica sheet, electric heating wires, a lower mica sheet and a bottom plate which are sequentially arranged in an overlapped mode from top to bottom, the electric heating wires comprise a plurality of sets of concentric square wave-shaped electric heating wires with different diameters, and the concentric square wave-shaped electric heating wires are provided with independent power supply channels; the power of each group of heating wires can be independently adjusted. The larger the circular frequency of the concentric square waveform curve is, the larger the density of the heating wires is, the heating distribution condition is adjusted on the basis of the frequency change rule, the distribution density of the heating wires at the center of the hot plate is low, the distribution density of the heating wires at the edge is high, heating is more uniform, and the efficiency and quality of the baking process are improved. 本发明公开了一种多温区