To calibrate the sensitivity coefficient of the triaxial force sensor, a new method for achieving a measurable triaxial impact force pulse with an inclined end Hopkinson bar is proposed. The influence of oblique angle θ on Z-axis measurement error through numerical calculation is analyzed. The vertical end Hopkinson bar is used to calibrate the Z-axis sensitivity of the B25B triaxial force sensor. The frequency characteristics of the sensor under the impact of the two configurations of bullets is analyzed. The relationship between the bullet configuration and the bandwidth of the loaded signal is established. Triaxial synchronous shock calibration for B25B triaxial force sensor is achieved by the inclined end Hopkinson bar, and the decoupling analysis realized by using the least square method. Results show that the sensor has a positive coupling relationship between the X-axis and Y-axis, and a negative coupling relationship between the X-、 Z- and Y- and Z-axis. The sensitivity coefficient varies linearly with the impact speed. Finally, the synchronous calibration result is used to test the force in the Z-axis direction. Compared with the uniaxial calibration, results show that the force calculated by the synchronous calibration result is closer to the measured force. The maximum relative error is 1. 73% .