▎ 摘　　要

NOVELTY - The utility model claims a graphene based on photoelectric emission ionization source, comprising a power supply, a first electrode, a graphene electrode and photo-emission device, the anode of the power supply connected to the first electrode, the cathode of the power supply connected with the graphene electrode, said photo-emission device to irradiate to the graphene electrode, wherein the graphene electrode comprises a supporting body, the supporting body comprises a first surface and a second surface which is set to support the first surface of the graphene structure layer; the graphene structure layer opposite to the first electrode; and leave the sample through the channel to the first electrode.