The invention provides a welding stick embedding vacuum electron beam welding method. A low-carbon welding stick is embedded in an initial weldment, and two continuous casting sheet billets are stacked and welded together through an electron beam in the vacuum environment and then are used for subsequent steel rolling production. The low-carbon welding stick is embedded, chemical components of a molten bath can be finely adjusted, a peritectic reaction area is avoided, and welding crack sensitivity of base metal is reduced. Compared with self-fluxing vacuum electron beam welding, the beneficial effects of high-energy density, high penetration performance, the small welding deformation area, easy control, the high production efficiency and the like of self-fluxing vacuum electron beam welding can be kept, meanwhile, the assembling precision during butt welding can be obviously improved, welding line formation is improved, and the mechanical performance of connectors is improved. By means of the method, the problem that a self-fluxing vacuum electron beam welding method is adopted in crack sensitivity steel grade welding, welding cracks happen is solved, the application range of vacuum electron beam welding is greatly enlarged, the method is suitable for mass industrial production, and obvious economical and social benefits are achieved.