Environmental pollution is becoming increasingly serious, the fog and haze continues to threaten human health, so real-time monitoring of pollutant emissions is needed. In order to more accurately predict the thermal power plant flue gas pollutant emissions and real-time display pollutant concentration on electronic map, this paper proposes a pollutant discharge monitoring display method for thermal power plant based on tower diffusion model. It optimizes the traditional pollutants diffusion model, and on the basis, puts forward a kind of new tower diffusion model to calculate the pollutant concentration, with which different pollutant concentrations are calculated hierarchically by using that the diffusion coefficient are at different heights. A large number of experiments prove that the proposed tower model improves the safety, accuracy and efficiency of the monitoring of flue gas pollutant emissions.