Rising local government debt and downturn in the real estate sector pose significant challenges to China’s economic growth and financial stability. To analyze these challenges, this paper develops a dynamic stochastic general equilibrium (DSGE) model to study the nexus between government debt risk, real estate sector, and financial stability. The findings suggest that an increase in debt risk initiated by a housing demand shock could have a persistent and magnified effect on the financial sector and the macroeconomy. The amplification mechanism originates from risk spillover and debt crowding-out effect, which trigger the negative feedback between the debt and financial risk. Longer debt maturity and the implementation of credit policy could effectively moderate the contractionary effects of this risk interaction on the economy.