In order to meet the application and test requirements of linear laser displacement sensor, a field calibration method of pixel equivalent of linear laser displacement sensor based on height block is proposed, in which the pixel equivalent in height direction is calibrated by step height to correct the linear error of pixel equivalent set by the manufacturer; the pixel equivalent in width direction is calibrated by step block combined with the transverse direction of sensor The calculation method of moving displacement is obtained. Considering that the linear laser displacement sensor may have tilt error, the tilt angle is calibrated by the height difference of step block width at different positions, and the height measurement error introduced by the tilt angle is corrected. Experimental results show that the method proposed in this paper can solve the problem of contour discontinuity in multi position measurement of linear laser displacement sensor.