In order to clarify the densification behavior of new Ag-Graphene composites prepared by low-pressure compressing and vacuum sintering, Ag-Graphene mixed powders with different graphene content from 0.5wt.% to 2.0wt.% were prepared by 24 h of ball milling and subsequently double action compressed and vacuum sintered. The densities of composites were measured after compressed and sintered, and the compressibility and sinterability of the composites at varying compaction pressures and varying sintering temperatures were also investigated. The experimental results show that the compaction data of all Ag-Graphene powders are fitted to the Balshin equation. The densification parameter (K values) increases with increasing the graphene contents which indicates the increasing of plastic deformation capacity. The Ag-0.5wt.%Graphene composite has the best sinterability. The composite with 1.5wt.% graphene exhibited much enhanced mechanical properties, namely, a tensile strength of 252 MPa can be achieved.