Abstract: On-Machine Measurement (OMM) systems are pivotal technologies for achieving closed-loop quality control in CNC machining. The accuracy of their core sensor, the touch-trigger probe, is significantly compromised by pre-travel error, while existing compensation methods are limited in practical engineering applications due to operational complexity and reliance on specialized equipment. Therefore, to address the challenge of the coupled interaction between the pre-travel error and installation eccentricity error in touch-trigger probes, a method based on multi-angle rotational measurement for reverse separation and integrated compensation is proposed. Using a standard ring gauge as a reference, a sequence of the gauge center coordinates is obtained through multi-angle sampling and least squares fitting. Subsequently, a strategy combining multi-angle rotational measurement with reverse separation is introduced to identify the installation eccentricity component coupled within the pre-travel error. Based on this, an integrated compensation model is established, constructed from rotational error and dynamic probe radius. To validate the effectiveness of the method, comparative verification was conducted through multi-angle spindle rotation touch-trigger experiments. The results demonstrate that the proposed method successfully separates the installation eccentricity error, and the obtained pre-travel error exhibits the expected pattern. Following integrated compensation, the measurement accuracy of the touch-trigger probe is significantly improved from 5 μm to 3 μm. This work provides a novel approach for compensating coupled errors in touch-trigger probes in OMM applications.