The utility model relates to a measuring device suitable for laser tracking appearance SMR target ball, it includes L shaped steel board, and the bottom of L shaped steel board is connected with unable adjustment base, and unable adjustment base's last fixed surface installs the circle level, and it has the ring channel to process in the upper portion side end face of L shaped steel board, and magnet base is installed in the inside cooperation of ring channel, and magnet base's center processing is fluted, and cooperate on the recess and install the SMR target ball, unable adjustment base's the bottom surface threaded hole of processing, the centering steel pricker is installed in the threaded hole cooperation. This measuring device can be arranged in the laser tracking appearance methods of measurement of high accuracy metallic structure or equipment fixing's constructional survey, can in time measure on the spot effectively or the laying -out, and the rapid survey goes out the three -dimensional coordinate of actual measurement station.