The invention particularly relates to a PC special-shaped beam and cast-in-place beam BIM combined modeling calculation method. The method is characterized by comprising the steps that 1, PC beam modeling of the superposed beam is carried out; 2, PC superposed beam special-shaped area modeling is carried out; step 3, PC superposed beam cast-in-place beam part modeling is carried out; and step 4, through combination modeling and summary calculation, engineering quantities of the PC special-shaped beam and the cast-in-place beam are obtained, and classified summary arrangement is carried out. According to the method, orderly and normative modeling of the PC and the the cast-in-place superposed beam are carried out through the BIM technology, rapid modeling and calculation of the steel bar formwork concrete in one model are completed, and an accurate basis is provided for construction budget settlement.