Ore grading screening device

The utility model relates to the technical field of ore screening devices, in particular to an ore grading screening device which comprises a screening box, a screening assembly and a bearing assembly, according to the ore grading screening device, a guide groove of the bearing box is aligned with a guide block of the screening box, an assembly block is aligned with an assembly groove, and after a connecting groove is aligned with a positioning hole, a spring drives a positioning block to move the screening assembly. One part of each positioning block extends into the corresponding positioning hole, so that the bearing box is convenient to assemble and disassemble, furthermore, the equipment is convenient to maintain and check, feeding is performed at a wide material opening, a supporting frame is arranged in a screening cavity, a vibrator drives a screening frame to vibrate, a screening net is arranged on the screening frame, and multiple sets of screening assemblies are arranged; the closer to the upper scr