The shale gas resources in the Sichuan Basin rank first in the country, and the resource rich deep shale gas blocks in southern Sichuan will become the main area for shale gas production. The coexistence of CO2/SRB in deep shale gas poses a huge challenge and threat to the corrosion integrity of carbon steel tubing. In this paper, The stress corrosion cracking (SCC) behavior of N80 carbon steel tubing in typical deep shale gas well under CO2/SRB coexisting conditions was investigated using the self designed High temperature high pressure autoclave and the slow strain rate tensile (SSRT) stress corrosion cracking experiment. The mechanical damage characteristics of N80 tubing under different constant load stresses in CO2/SRB environment were explored. The crack propagation law and fracture morphology characteristics were observed using microscopic analysis technology, and the SCC sensitivity of N80 steel was comprehensively evaluated. The experimental results show that the tensile strength and yield strength of N80 tubing steel reduces, which exhibits stress corrosion sensitivity under different working stress conditions; The elongation and reduction of area decrease sharply, which indicates that the decrease of the plastic performance. The wellhead is under high load and the wellbore temperature is ≥ 100 °C, there is a significant attenuation of mechanical parameters. The maximum reduction in yield strength and tensile strength at the wellhead is 8.11% and 7.15%, respectively. The decrease in yield strength and tensile strength at the 100 °C section is 7.00% and 7.15%, respectively. The corrosion rate at the temperature ≥ 100 °C section is high, but its impact on strength is limited. The study on stress corrosion of carbon steel tubing in deep shale gas provides a theoretical reference for the material selection, design and optimization of tubing for completion engineers.