I High ground temperature is one of the common phenomena in the development of deep underground engineering in China. The damage problem of high ground temperature shotcrete has become a hot and difficult problem at home and abroad. Based on the existing research results, through uniaxial compression test, Brazilian splitting test, ultrasonic test and CT scanning test of shotcrete specimens, the relative damage is defined by wave velocity, and the compressive strength, tensile-compression ratio and void ratio are used as macro and micro characterization parameters of shotcrete damage to analyze the evolution law of compressive strength, tensile-compression ratio, void ratio and relative damage of shotcrete under different surrounding rock temperatures. The results show that the tensile and compressive strength of shotcrete gradually decreases with the increase of temperature, and the compressive strength is more sensitive to the change of temperature. Wave velocity has a linear negative correlation with temperature, while the relative damage variable has a nonlinear positive correlation with temperature. The increase of temperature leads to the dense distribution of pores in shotcrete, the coalescence of pores, the formation of initial defects, and the aggravation of temperature damage. The relevant research results are expected to provide a theoretical basis for the safe construction and operation of tunnels under high geothermal environment in China.