This paper focuses on China's green financial development context, selects carbon taxes and green credit policies as adjustable fiscal instruments, constructs a four-sector dynamic stochastic general equilibrium (DSGE) model, and innovatively divides the production sector into traditional and clean firms. We then separately investigate the impacts of these two structural policies on green economic development. The impact of structural policies on the development of green economy and emission reduction is investigated individually in terms of each policy. The results of the study show that the positive impacts of green credit and pollution tax rate have a significant inhibiting effect on pollution emissions; for total output, the policy of adjusting the carbon tax rate has a negative impact on economic development, while the negative impacts of targeted subsidy on economic development in the long run are not obvious. Based on this, this paper combines the green development practice to put forward the corresponding policy recommendations for the construction of a green low-carbon development policy system to provide references.