The invention discloses an analyzing method for a temperature field of an integral fuel tank, and belongs to the technical field of aircraft designs. The method includes the following steps: step 1, establishing a simulation model of an integral fuel tank structure, and determining a fuel space area inside the integral fuel tank structure; step 2, filling the fuel space area with simulation fuel so that the fuel space area is full of fuel; step 3, further dividing the simulation fuel in the fuel space area into n layers; step 4, applying aerodynamic heating data, changing along with the time, on the aerodynamic surface of the integral fuel tank structure; step 5, carrying out fuel consumption and filling gas simulation through a ladder simulation method; and step 6, obtaining a change result of the temperature of the integral fuel tank structure along with the time after the fuel consumption simulation through the ladder simulation structure. According to the method, temperature field changes of the structure can be effectively obtained without being limited by test equipment or test environments, the product design period is short, and the design efficiency is improved. The analyzing method is easy to promote and apply, and has great practical values.