Temperature and humidity measurement instrument

The invention discloses a temperature and humidity measurement instrument. The temperature and humidity measurement instrument comprises a temperature and humidity sensor, an anti-radiation cover anda supporting plate. The anti-radiation cover comprises multiple cover bodies and a bottom support. The outer diameters of the cover bodies from the lower opening end to the upper opening end are gradually reduced. The cover bodies are arranged on the bottom support through lamination, a gap is formed between the cover body of the lowest layer and the bottom support, and a gap is formed between every two adjacent cover bodies. The upper opening end of the cover body of the uppermost layer is hermetically connected with the supporting plate. According to the anti-radiation cover with a lamination structure, the temperature and humidity sensor is prevented from being influenced by rainwater and sun radiation, and the cover also has good air circulation performance. Meanwhile, the wind resistance of the anti-radiation