The invention discloses a calculation module for a numerical weather forecast mode based on urban canopy man-made heat. The module comprises a measurement unit and a calculation unit; the density of the building is calculated according to the average height of the building of a urban street valley and the average width of the street valley which are obtained by measuring; the maximum value of theman-made heat is determined according to the obtained building density value; the man-made heat is obtained according to the maximum value of the human heat and a proportion coefficient; the man-madeheat flux is obtained through calculation according to the man-made heat and an adjustable function, the height of test points perpendicular to the ground surface, the air density and the heat conductivity of the test points; and the obtained man-made heat flux is added into a capacity balance equation heat item in a numerical weather forecast mode. According to the calculation module, the man-made heat flux is added into the capacity balance equation heat item in the numerical weather forecast mode, the problems that the simulation capability of the numerical weather forecast mode on the urban air temperature is poor and urban air temperature can be estimated in most situations can be effectively improved, so that the urban air temperature can be simulated more accurately by the numericalweather forecast mode.