The invention relates to fully recycled regenerated glass fiber reinforced plastic reinforced concrete and a preparation method thereof, wherein the concrete comprises the components in parts by weight: 14.4 to 17.6 parts of ordinary Portland cement, 2.7 to 3.3 parts of fly ash, 0.9 to 1.1 parts of silica fume, 31.6 to 36.5 parts of a fine aggregate, 47.34 to 57.86 parts of a coarse aggregate, 2.1to 4.9 parts of regenerated glass fiber reinforced plastic, 1.35 to 1.85 parts of a water reducing agent, and 9 to 9.27 parts of water. The regenerated glass fiber reinforced plastic comprises regenerated fibers and glass fiber reinforced plastic powder, the content of the glass fiber reinforced plastic powder is not more than 20%, the length of the regenerated fibers is not larger than 10 mm, and the particle size of the glass fiber reinforced plastic powder is not more than 1 mm. The concrete realizes full recycling of the regenerated glass fiber reinforced plastic, has high working performance, meets the pumping requirement, and has good ductility while the strength meets the standard requirement. The concrete solves the problems of shortage of sandstone material resources, limited glass fiber reinforced plastic waste recycling way and low utilization rate, and is beneficial to promoting the practical engineering application of glass fiber reinforced plastic solid wastes in building materials.