As the real estate industry is a high value-added industry，it is related to the adjustment of social consumption institutions，urban modernization，urban construction planning，local fiscal revenue，improving people’s living standards，solving employment and other core issues，and it will also have an impact on more than 60 upstream and downstream industries. Every big fluctuation of its industry will affect the changes of other related industries in China’s economic development. This paper uses AHP as a tool to quantitatively calculate the real estate financial risk index of Beijing from 2015 to 2020. The results show that on the whole，the real estate financial risk of Beijing has been effectively controlled，and the policy of “real estate，housing and non-speculation” is effective.