Abstract: In order to meet the increasingly huge demand for high-speed magnetic flux leakage steel pipe detecting equipment, based on the working principle and method for such equipment, the coauthors point out and analyze the critical techniques. The high-speed magnetic flux leakage  180 steel pipe detecting system has been developed, which is operating with the pipe rotating spirally. This paper has introduced the detecting trajectory planning and overall layout of this equipment. The design principle and structure of the core components such as the transverse and longitudinal defects detecting device and demagnetizer are described in detail. It has been proved in field application that the performance of the equipment is of high quality because it can meet both the testing requirements of the relevant standards and the high-speed testing requirements of steel pipe production line.