Coordination polymer (CP) glasses offer aw ay to tackle the fabrication challenges encountered by inorganic porous membranes and showgreat potentials for size-exclusive gas separation. However,their processability and performance still cannot simultaneously meet the requirements for highperformance membrane separation. Herein, we have developed aseries of CP glasses (M-P-dmbIm, M = Zn, Cd, Cu, and Mn), whichpossess low vitrification temperature as well as low viscosity (h)a nd lave capability above the transition temperatures.T he derived glass (a g M-P-dmbIm) membranes show outstanding performances for H 2 /CO 2 ,H 2 /N 2 ,a nd H 2 /CH 4 separation, whicha ll far surpass the Robeson upper bound and even rival against the best of the state-of-the-art gas separation membranes.The low viscosities not only allowusto hot-cast or hot-press the CP glasses into thin membranes within 5min without sacrificing their selectivity and permeability,but also endowt he resulted glass membranes with healing ability.