The wing beam of medium fixed-wing unmanned aerial vehicle was a carbon fiber composite laminated structure. Although the conventional female mold-prepreg molding method could greatly improve the dimensional stability of the shape， it is difficult to ensure the positive pressure at the rounded corners and the phenomenon of bridging and bubble wrapping due to its forming even when the silicon rubber core mold was introduced. In this paper， the combined adaptive equalizing plate auxiliary tooling and the male mold-prepreg forming method were used to ensure the outer surface quality of the wing beam parts， and not only improve the inner surface quality of the wing beam parts significantly， but also simplify the process obviously， which greatly avoids the phenomenon of bridging and bubble wrapping caused by the forming. Through the furnace production and performance test， the bending strength， bending modulus and interlaminar shear strength of unidirectional prepreg are 1 549 MPa， 110 GPa and 87 MPa， respectively.