Moiré tomography is applied to measure the complex density distribution in supersonic wind tunnel. Multidirectional moiré fringe patterns of flow field in supersonic wind tunnel are obtained by using high precision moiré deflectometer and discrete angle rotating mode. In the tomography, a new moiré tomographic algorithm with deflection angle revision iteration is employed to realize the limited angle sampling and incomplete data reconstruction containing covering. In the iterative process higher reconstructing precision is achieved by using inner boundary smoothing filtering. In experiments, 9 tomograms with different view angles in supersonic wind tunnel with Mach number 2.52 are obtained, the distribution on the cross section of asymmetric flow field in the swelling area of supersonic wind tunnel is reconstructed after 50 iterative computations, and the measured results and errors are analyzed and discussed. Computing fluid dynamics is used to simulate and compute the density field, verifies the validity of the reconstruction results of moiré tomography, and proves the important value of the technology in measuring complex fluid field.