The invention relates to a basis tracking prestack seismic inversion method based on reflection coefficient precision. The method comprises the following steps: 1, obtaining pre-stack angle gather seismic data and post-stack seismic data of a thin or thin interbed sand shale reservoir; 2, obtaining an inversion initial elastic parameter model; 3, calculating based on a Zoeppritz equation to obtain a time-angle domain reflection coefficient sequence, and constructing a target function related to the inversion elastic parameter model; 4, updating the inversion elastic parameter model; 5, if the residual error of the synthetic pre-stack angle gather seismic data and the actual pre-stack gather data reaches an iteration threshold value, outputting an inversion elastic parameter model, and if not, entering step 6; and 6, updating the number of iterations, and returning to the step 3 to enter the next iteration until the iteration is terminated. The method can be suitable for thin or thin interbed reservoir geologic models, and elastic parameter inversion results are extracted in a high-precision and high-resolution mode.