Abstract: In order to study the positioning error of the roadheader, based on the ultra-wideband ranging technique, according to the Time Sum of Arrival(TSOA) positioning principle, indirect method was used to solve the coordinates of the positioning point. The distribution of positioning points in space was simulated and analyzed. The positioning errors of the three coordinate axes were analyzed, and the distribution law of positioning errors in the range of 10m to 100m was obtained, which provided the basis for position and pose detection of the roadheader.