Three-dimensional informatization model design method and device for railway turnout

The invention provides a three-dimensional informatization model design method and device for a railway turnout, and the method comprises the steps: obtaining a target turnout track design parameter inputted by a user, and determining a key point of a target turnout according to the track design parameter; selecting a key control section of the target turnout from a pre-established key control section information base as a lofting contour; creating a guide line according to the key point and a drawing instruction input by a user; establishing a turnout steel rail informatization model according to the guide line and the lofting outline; under-rail structure design parameters input by a user are obtained, and an under-rail structure model of the target turnout is selected from a pre-established BIM model library according to the under-rail structure design parameters; and the under-rail structure model and the turnout steel rail informatization model are assembled, and a three-dimensional informatization model