The invention discloses a direct inversion method for pre-stack seismic data. By constructing the mapping from the observation data to the model parameters as the inversion operator, and using the constructed inversion operator to realize the direct inversion of pre-stack seismic data, the calculation efficiency is improved, the calculation amount is reduced, and effectively avoid the problem of the dependence on the initial model and reducing the convergence of inversion results. The method comprises the following implementation steps of (1) obtaining limited set observation data and model parameter data corresponding thereto as sample data; (2) arranging the obtained sample data; (3) constructing the mapping from the observation data to the model parameters; and (4) directly inverting the data to be inverted by using the constructed mapping relationship.