Screw rod focusing microscopic device

The utility model discloses a screw rod focusing microscopic device, which relates to the technical field of microscopes and comprises a microscope host, a host bracket, a support column and a base, the microscope host is mounted on the host bracket, the host bracket is in sliding fit with the support column, and the support column is vertically arranged on the base. The supporting column is a hollow column with the two ends provided with an upper bearing seat and a lower bearing seat, a trapezoidal lead screw and a nut seat are coaxially arranged in the supporting column, a nut of the trapezoidal lead screw is fixed to the nut seat, and the lead screw of the trapezoidal lead screw penetrates through the nut and the nut seat and is connected with the upper bearing seat and the lower bearing seat through bearings. The upper end of the lead screw extends out of the supporting column and is fixedly connected with a hand wheel. A long hole is also axially formed in the wall body of the supporting column, and the