The invention relates to automatic machining equipment for spherical surfaces of automobile overturning safety cylinder bottom U-shaped clamps and belongs to the field of mechanical manufacturing. A material pushing and transporting mechanism is fixed to an upper platform surface. A steel ball feeding and fetching mechanism, a steel ball hitting mechanism and a U-shaped clamp screening mechanism are fixed to an upper plate and supported by a main frame. The U-shaped clamps are fed to the steel ball hitting mechanism through the material pushing and transporting mechanism, machining of the spherical surfaces is completed, and then the U-shaped clamps are screened through the screening mechanism. The automatic machining equipment has the advantages that modular design is conducted, the structure is novel, the functions are rich, the automation degree is high, the finished products are machined at a time, the unqualified products are automatically screened, and the working efficiency is high; and in addition, the screening mechanism is controlled by a PLC, so that participation of people is avoided, the labor force is saved, and the production cost is reduced. The complete machine fully considers the reliability design and conducts modular design, and maintenance and management in the future are convenient.