The invention discloses a preparation method of an antistatic hard polyvinyl chloride material, and belongs to the technical field of functional material preparation. According to the preparation method, peeling of expandable graphite is carried out with microwave so as to obtain expanded graphite; expanded graphite and one-dimensional carbon fiber are taken as conductive filling materials, and are subjected to open mill blending with PVC, and hot pressing and cold pressing moulding so as to obtain the antistatic hard polyvinyl chloride material. According to the preparation method, peeling ofexpandable graphite and surface modification are realized based on microwave technology, so that a graphite two dimensional filling material system with surface PVC compatibility and containing nanometer graphite flakes is obtained, coordinating of the carbon fiber one-dimensional filling system is realized, construction of a network structure is realized, excellent mechanical properties and antistatic performance at a low filling amount are achieved. Hard PVC is provided with antistatic performance by the microwave expanded graphite/carbon fiber/PVC multicomponent filing system.