In order to improve the computational precision and efficiency of heat transfer of cavity medium of scroll compressor, the Symlet wavelet 10 finite element model is constructed by using the Symlet wavelet 10 function as interpolation function. The heat transfer model of cavity medium of scroll compressor under leakage flow is constructed based on large eddy simulation technology. Heat transfer analysis of cavity medium of scroll compressor is analyzed based on theoretical and experimental analysis. Results show that the Symlet wavelet 10 finite element model has higher precision and higher efficiency than the other two simulations. In addition, the influences of axis meshing clearance and radial meshing clearance on temperature of cavity medium of scroll compressor are discussed, the temperature of cavity medium of scroll compressor increases with axis meshing clearance and radial meshing clearance. The theoretical results can provide the favorable guidance for optimal design and operation of scroll compressor.