The invention discloses an assembled foundation pit drainage and protection system suitable for industrial production. The system comprises drainage devices horizontally arranged at two ends of a surface layer of foundation pit concrete; a water stop device is arranged between the drainage device arranged at the upper end of a foundation pit and the foundation pit; a protection net or a protection rod is arranged at the top of the water stop device; and the water drainage devices and the water stop device are both factory concrete prefabricated parts. The system adopts U-shaped or inverted trapezoidal drainage tanks, is convenient for manufacturing, is high in water drainage quantity, and facilitates fast water drainage; a steel pipe is arranged at the bottom of the protection rod, and a thread is arranged out of the steel pipe, so that the protection rod is convenient to screw in and out the water stop wall, the labor hour is saved, and meanwhile, the recycling of the protection rod is realized; and the whole drainage and protection system is simple in structure, convenient for construction, high in recycling rate of all parts and capable of realizing effective drainage of underground engineering.