The application field of longitudinally welded pipe is expanding day by day, and its quality requirements are increasing.The inner burr removal device, as a key equipment to improve the quality of the inner surface of the longitudinally welded pipe, has gradually attracted the attention of manufacturers.Taking the high frequency longitudinally welded pipe with constant bottom surface as the research object, an inner burr removal device was proposed based on the cantilever arbor to improve the burr scraping quality of the welded pipe.According to the working principle and functional requirements of the inner burr removal device, the structure of the inner burr removal device was designed and the three-dimensional model was established; According to the actual production conditions, using the ANSYS software, the finite element model of the inner burr removal device under different extreme working conditions was established and simulation analysis was performed to ensure the rationality of the structural design.The inner burr removal device, which integrates lifting, rotating, knife lifting and other auxiliary movements, also has the function of online breaking the inner burr, avoiding falling off inner burrs to block the welded pipe, enriching the functions of the inner burr removal device and laying a foundation for product development.