The invention discloses a rock-like cuboid test sample manufacturing platform device. The device comprises a base plate, transverse side plates, longitudinal side plates, transverse connecting bolts and longitudinal connecting bolts; the lower end of the base plate is provided with four horizontal adjustment footstands, the upper end of the base plate is provided with four grooves, and each groove corresponds to one side plate; the longitudinal side plates are arranged in parallel, the inner sides of the longitudinal side plates are each provided with a pair of grooves, the width of the grooves is consistent with that of the transverse side plates, and the middles of the grooves are provided with circular through holes for allowing the transverse connecting bolts to penetrate through in the horizontal direction; the transverse side plates are arranged in parallel, the two ends of each transverse side plate are provided with screw holes which have the certain depth in the horizontal direction and contain inner threads respectively, the screw holes correspond to the circular through holes formed in the grooves of the longitudinal side plates, and the middles of the transverse side plates are provided with circular through holes which allow the longitudinal connecting bolts to penetrate through in the vertical direction and correspond to screw holes formed in the transverse grooves of the base plate; the two ends of each transverse side plate are installed in the grooves formed in the corresponding longitudinal side plates. The device is simple in structure, convenient to operate and capable of quickly, easily, conveniently and precisely manufacturing a rock-like test sample with the specified size.