The invention discloses a simulation method of a high accuracy preset laser cladding coating temperature field, aiming to the insufficiencies of a traditional simulation method of a temperature field value in a preset laser cladding process. The method carries out simulation by dividing a geometric model into an air hole model and a metallurgy model and dynamically changing a contact thermal resistance, fully utilizes the strong simulation functions of an ANSYS (Analysis System) software, has the advantages of high result accuracy and favorable truth and provides a feasible measure for laser cladding study.