Separation box for filling lithium salt additive particles

The invention discloses a separation box for filling lithium salt additive particles, which comprises a filling box and a cover sealing box, a canning structure is arranged on the filling box, a capping machine is arranged on the cover sealing box, the separation box further comprises a graded material injection structure, the canning structure comprises a coarse material injection device and a precise material injection device, the graded material injection structure comprises a guide rail arranged at the bottom in the filling box, a sliding module is arranged in the guide rail, and a bottle carrying tool is connected to the sliding module in a locked mode. The separated material uniformizing structure comprises a movable connecting assembly arranged between the two bottle carrying tools, a polarization structure is arranged at the lower end of the guide rail and fixed to a telescopic structure, and a separation assembly is arranged on the side, close to the thick-amount material injector, of the polarizatio