Dustproof mathematical calculation device convenient to assemble

The utility model discloses a dustproof mathematical calculation device convenient to assemble. Including a base, base is disc-shaped, a first threaded hole is formed in the middle of the upper surface of the base; a first supporting rod is in threaded connection in the first threaded hole; the first supporting rod is a stainless steel pipe; a second supporting rod is movably sleeved with the upper end of the first supporting rod; the second supporting rod is a stainless steel pipe; a positioning structure is arranged at the upper part of the outer surface of the first support rod; the secondsupporting rod is fixed in the first supporting rod through a positioning structure, a mounting seat is arranged at the upper end of the second supporting rod, a bearing is arranged on the upper surface of the mounting seat, a supporting rod is sleeved with an inner ring of the bearing, a calculation plate is obliquely arranged on the upper surface of the supporting rod, a groove is formed in theright side face of the cal