Existing research has largely proved the negative impact of environmental regulations on enterprises, mainly represented by the decline in innovation ability, the decline in productivity and the increase in production costs, which has led to a decline in the competitiveness of enterprises. This paper uses data to examine a more direct effect, that is, the increased intensity of government regulations will make companies face stricter emission standards, and chinese companies will need to spend more to meet the requirements, which will increase environmental protection-related expenditures and increase production costs. I used empirical analysis and heterogeneity test to find that the government’s environmental regulations have a greater impact on non-state-owned enterprises and enterprises in the eastern region of China. And the findings reveal a significant negative correlation between the intensity of environmental monitoring and corporate investment in environmental protection, with high-polluting companies investing more in environmental protection compared to low-polluting companies.