Thermometer capable of being assembled and disassembled in pen

The utility model relates to a thermometer capable of being assembled and disassembled in a pen, and belongs to the technical field of thermometers, the thermometer capable of being assembled and disassembled in the pen comprises a thermometer shell, the thermometer shell is of a tube body structure and a thin tube, the thin tube is arranged on the side wall of the thermometer shell, and the cross section of the thin tube is of an arc-shaped structure attached to the side wall of the thermometer shell. One side of the slim tube is provided with scales, the liquid bubble is arranged at one end of the thermometer shell, and the liquid bubble is communicated with the slim tube; according to the utility model, the thermometer shell can be of a tube body structure, an annular cylinder with a smooth surface, or a polygonal annular cylinder, a refill can pass through the hole in the middle of the thermometer shell, and the thermometer can be quickly mounted in the pen shell and can be quickly taken out through the a