Microscopic devices and focusing methods thereof

A microscopic device, comprising:

• an object stage configured to carry a transparent carrier, wherein the transparent carrier includes at least two object positions, and the object stage is configured to drive the transparent carrier to translate to move, so that each of the at least two object positions on the transparent carrier moves to a measurement position;
• a microscopic objective located on a side of the object stage;
• a rangefinder located on a same side of the object stage as the microscopic objective, wherein the rangefinder and the microscopic objective are located at a same height relative to the object stage, and the rangefinder is configured to measure a distance between a surface of each of the at least two object positions and the microscopic objective;
• and
• a focusing module configured to adjust a position of the microscopic objective along a first direction based on the distance measured by the rangefinder, wherein the rangefinder and the microscopic objective are both connected to the focusing module and the first direction is perpendicular to a carrying surface of the object stage.