The invention provides a thermal power unit bidding method and a device based on new energy power prediction. The predicted generation power of the new energy is firstly determined; the predicted generation amount of the new energy is then calculated; and finally, when the predicted generation amount of the new energy is larger than or equal to the preset ratio of the rated generation amount of the new energy, the bidding of the thermal power unit is determined according to the operation coal consumption of the thermal power unit and the coal consumption converted by power-on cost. According to the technical scheme provided in the invention, the self coal consumption and the operation cost of the thermal power unit are considered, volatility of output of the new energy in the area is alsoconsidered, the generation space of the thermal power unit can be prevented from being occupied by the new energy, the market clearing price is improved, and the sustainable and healthy development ofthe electricity market is facilitated.