The invention discloses a beam structure prefabricated formwork fixing component, which comprises a plate frame and two press plates, wherein the two press plates have opposite relationship; a gap used for clamping a formwork is formed between the two press plates; the beam structure prefabricated formwork fixing component also comprises push plate assemblies respectively corresponding to different press plates; the push plate assembly of each press plate is used for pushing the press plate to move towards one side of the other press plate; the push plate assembly comprises a compression screw bolt, a spring and an anti-loosening screw bolt; the compression screw bolt is connected onto the plate frame through screw threads; the compression screw bolt is in contact with the outer side surface of the corresponding press plate; the anti-loosening screw bolt is connected onto the plate frame through screw threads; the axial line of the anti-loosening screw bolt is parallel to the axial line of the corresponding compression screw bolt; the spring is arranged between the corresponding press plate and the corresponding anti-loosening screw bolt. The clamp is applicable to the manufacturing of the beam structure prefabricated components with complicated shapes, and can reach the technical effect that in the prefabricated component curing process, the slurry leakage quantity is reduced, or the slurry leakage is avoided.