The invention discloses a method for simulating temperature field distribution during solid state fermentation and belongs to the technical field of analog simulation.The method comprises the steps of 1, determining the planes where the fermentation substrate temperature field is distributed, wherein the planes include the axial plane and the radial plane, online temperature sensors are arranged in the planes where the temperature field is distributed, temperature sensors are arranged in the axial direction from the upper portion to the lower portion, and temperature sensors are arranged in the radial direction from left to right; 2, drawing the geometric area of the temperature field; 3, conducting numerical calculation on a PDE with FEM, wherein triangular mesh subdivision, equation discretization and equation numerical solution solving are conducted; 4, setting parameters, boundary conditions and initial conditions on the interface of a PDE toolbox of MATLAB; 5, setting the type of a partial differential control equation; 6, substituting calorimetric analysis parameters during SSF into a heat conduction equation, calculating the heat quantity of a heat conduction, and establishing a temperature field used for simulating two-dimensional and three-dimensional non-steady-state models in the fermentation substrate.Compared with relevant programming methods, the method has the advantages of being flexible, simple and higher in solving precision.