The invention relates to the technical field of biomass fuels, in particular to a composite biomass particle fuel which is prepared from fuel substrates, graphene and coconut shell powder. The fuel substrates are prepared from wheat straws, wood chips, corncobs, peanut shells, rice straws, rice hulls, oil-tea shells and cottonseed hulls. The composite biomass particle fuel has the advantages thatthe fuel is high in combustion efficiency, moderate in combustion speed and long in combustion continuing time, combustion heat can be gently released, heat is continuously supplied and the like. Thefuel is quite suitable for meeting production requirements of finish machining enterprises.