Light-gathering protective sleeve of thermometer

The utility model discloses a light-gathering protective sleeve of a thermometer, which solves the problems that in the practical production, thermometers are fragile and easy to be broken, and indication of the thermometers is not easy to read in dark environments. A main body of the light-gathering protective sleeve of the thermometer is divided into an upper sleeve, a transitional sleeve and a lower sleeve from up to bottom, wherein the internal diameter of the upper sleeve is greater than the external diameter of the thermometer, a vertical bar-shaped gap is arranged on the side wall of the upper sleeve, the width of the gap is greater than the external diameter of the thermometer and the length of the gap equals to that of the upper sleeve, and the thermometer is inserted into the lower sleeve; and the protective sleeve also comprises a reflection sheet whose surface is irregular, wherein the reflection sheet is plastered on the inner wall of the upper sleeve. The metal protective sleeve of the utility m