With the gradual maturity of space and space technology in the future, mankind will usher in the status quo of large-scale exploitation of space resources in the near future. However, due to the uncertainty of the future situation and the limitations of development conditions, space mining will have a far-reaching impact on the world. This paper determines the relevant 12 sub indicators, adopts TOPSIS method and unfair variation index (CV), establishes a measurement model of global equity, and selects 21 countries according to intercontinental geography and national development level to verify the regional equality. The paper proposes to establish a win-win cooperation mechanism and strengthen resource exchange and other relevant policy suggestions to safeguard the common interests of mankind.