The invention discloses a vehicle repair plant wastewater treatment system. The system comprises a grid, a grit chamber, a high-order reaction tank, MBR treatment equipment, a water storage tank, a dry ice storage tank, a liquid chemical storage tank and the like. The system is in a creative design, water and oil are separated by a physical method, a photochemical treatment technology is utilizedto completely decompose organic matter, and a reaction rate is quickened by adding hydrogen peroxide and a titanium dioxide catalyst and using a unique glass reactor design. The whole system is in anautomatic design, achieves one-key treatment, avoids waiting, is not suitable for technologies of sludge and the like, cannot generate twice pollution and can achieve sewage regeneration within 24 hours.