The invention provides a composite plastic plate material, a preparation method, a template and a shaping method and belongs to the technical field of construction mold engineering. By means of the composite plastic plate material, the preparation method, the template and the shaping method, preparation of the composite plastic plate material and shaping of the composite plastic template can be realized, and by means of the manner that a plastic face layer is in contact with concrete, the tensile performance is enhanced through a first fiber layer and a second fiber layer, the tensile performance and the shear resistance performance are enhanced through a net rib reinforcing layer, and mold expansion or local bulging caused by concrete heating and expansion is lightened and avoided; furthermore, when bending is needed, the bending can further be conveniently performed through bending grooves arranged in a reinforcing base layer after reinforcing ribs are cut off, a curved surface or corner form can be formed without splicing, and no splicing seams exist; when the bending is not needed, the reinforcing ribs can avoid stress concentration in the bending grooves, and then local deformation is avoided; and meanwhile, the net rib reinforcing layer and the plastic face layer are of layered structures, materials of the plastic face layer and the net rib reinforcing layer can be different, saving of resources is facilitated, and the cost is reduced.