A gymnasium indoor sports environment health degree assessment method applicable to hot and humid areas disclosed by the present invention comprises the following sequential steps of: according to relationships between an overall indoor sports environment health degree and a thermal environment, a light environment, and air quality that affect the indoor sports environment health degree, forming a comprehensive assessment index PM formula by using a weighted linear synthesizing method, wherein the comprehensive assessment index PM formula comprises a thermal environment subindex PMV, a light environment subindex PMVL and an air quality subindex PMVA; calculating weight values of the thermal environment subindex PMV, the light environment subindex PMVL and the air quality subindex PMVA by using an analytic hierarchy process; and forming a subindex table of the thermal environment, the light environment, the air quality and the indoor sports environment health degree according to the Fanger thermal comfort scale. The assessment method of the present invention implements the assessment of the gymnasium indoor sports environment health degree assessment of hot and humid areas in different seasons.