The present invention relates to a graphene supported PVP stable nanometer Ru catalyst, a preparation method and uses thereof, wherein the catalyst comprises an active component PVP stable nanometer Ru catalyst and a carrier graphene, the PVP stable nanometer Ru catalyst and the graphene are self-assembled through a physical and chemical adsorption method, and a weight ratio of the PVP stable nanometer Ru catalyst to the graphene is 1-50:1. According to the present invention, the prepared catalyst can be used for efficiently catalyzing sodium borohydride and ammonia borane to produce hydrogen, and further has characteristics of excellent repeat use performance and good thermal stability.