The invention discloses a project monthly fund budget arrangement platform authorization management method. According to the method, operation authorization of planning administrators, contract administrators, budget administrators, project managers, bosses, authority administrators, and finance staff are arranged on the project monthly fund budget arrangement platform. And the planning administrators, contract administrators, project managers, bosses, authorization administrators, and finance staff must operate in accordance with respective authorization, which prevents maloperation and modification to stated project monthly fund plans beyond authority and is conducive to budget management.