Sample separating device used in salt manufacturing process

The utility model discloses a sample separating device used in a salt manufacturing process. The sample separating device comprises a screening box, a material guiding pipe, a pushing assembly, a screening assembly, a limiting assembly and a fine salt box, the material guide pipe is communicated with the screening box; the pushing assembly is arranged in the screening box and used for pushing the screening assembly. The screening assembly comprises at least two screening frames and two filter screens; one ends of the two screening frames are hinged to the pushing assembly, the other ends of the two screening frames are connected to the limiting assembly, and the filter screens are obliquely and detachably connected to the interiors of the screening frames; the limiting assembly comprises a vertical plate, a bearing spring and a material limiting rod; the vertical plate is movably connected into a movable cavity in the screening box. The vertical plate is connected with the screening frame. The technical probl