Accurate contact force perception is key to achieving active compliance assembly of aviation interference fit shaft-hole components using the temperature difference method. However, non-contact forces (e.g., gravity and inertial forces) induced by the load can interfere with force perception, thereby affecting the accuracy and stability of the assembly process. To address this issue, a contact force perception method based on the joint force sensors of a parallel posture adjustment mechanism is proposed. First, a self-calibration strategy is introduced to calibrate the mounting tilt angle of the posture adjustment mechanism base. Then, the method for calculating the contact force between components during active compliance assembly is described, and a load dynamics parameter identification model is established based on the principle of force translation and rigid body rotation. Next, the reliability of the parameter identification and contact force perception algorithms is verified through cosimulations using Adams and Simulink. Finally, experiments to verify the contact force perception accuracy are conducted on an active compliance assembly platform built in the laboratory. The results show that the proposed method can accurately identify the load dynamics parameters, achieve precise non-contact force compensation, and significantly reduce force perception errors.