The utility model discloses a rescue capsule positive pressure maintenance system, belongs to the technical field of rescue capsules, and aims at providing a rescue capsule positive pressure maintenance system which is low in cost, simple in structure and convenient to operate. A stop valve is mounted on a compressed air bottle which is communicated with one air inlet of a shuttle valve through a high pressure metal hose. A first reducing valve is mounted on the high pressure metal hose arranged between the compressed air bottle and the shuttle valve. The other air inlet of the shuttle valve is connected with the high pressure metal hose to lead to the outside of an airtight capsule body. An air outlet of the shuttle valve is connected with one end of a three-level filter, and the other end of the three-level filter is provided with a second reducing valve and a first ball valve. An air outlet of a pressure relief pipe is mounted on the capsule wall of the airtight capsule body, and one end of the air outlet of the pressure relief pipe extends outside the airtight capsule body. The other end of the air outlet of the pressure relief pipe is located inside the airtight capsule body, and the end is provided with a second ball valve and a one-way valve. The rescue capsule positive pressure maintenance system is used for maintenance of positive pressure inside a rescue capsule and protection of safety of refugees.