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Objective To detect the machining precision of the rotor impeller in the micro-axial blood pump. To establish the method to detect the machining precision of the micro-axial blood pump with complex blade profiles. Methods Firstly, we got the point cloud of the impeller based on 3D laser scanning technology in this paper. Then we built the three dimensional model of the impeller using the point cloud dealt with Geomagic Studio Microsoft. The two impeller models we built and we designed were imported into the Geomagic Qualify Microsoft and were compared. Then we analyzed the machining precision of all rotor impeller surfaces of the FW- 2 type blood pump whose rotor had complex surfaces. Results The overall machining precision of the FW- 2 type blood pump impeller satisfied our demands and only a small region on the impeller surfaces was of lower machining precision. Conclusions The technology that 3D-laser scanning combined with reversing 3D modeling is an effective method to detect complex impeller of micro blood pump. This research supplies a new thought for the machining precision detection of micro blood pump impeller and is of great importance to confirm the cause of thrombus to improve the pump design.