The invention provides a passive containment inner spraying and shell-wall heat removal system. The system comprises a pressure accumulating water tank, a water outlet pipeline of the pressure accumulating water tank, a spraying collecting pipe and nozzles; the water outlet pipeline of the pressure accumulating water tank is connected with the pressure accumulating water tank; the spraying collecting pipe is connected with the water outlet pipeline of the pressure accumulating water tank; and the nozzles are arranged on the spraying collecting pipe. According to the passive containment inner spraying and shell-wall heat removal system provided by the invention, a passive mode is adopted, and continuous passive cooling can also be provided under the condition of other accidents or malfunction of a containment heat removal device, so that the integrity of the containment is effectively ensured, and the safety of a power plant is further improved.