This paper describes a method for calculating the spatial magnetic field density of bipolar coils. The models of DD, DDQ and BP bipolar coupling coils are established by using the Partial Element Equivalent Circuit method (PEEC), and the spatial magnetic flux density distributions of bipolar coupling coils are calculated. Combined with MATLAB, the distribution maps of magnetic flux density under different relative error constraints are constructed; therefore, the visualization of magnetic flux density envelope map of DD, DDQ and BP coils are realized. The results are verified by ANSYS Maxwell, which proves the feasibility of using PEEC method to analyze and compare the spatial magnetic flux density distribution of different coils.