The invention relates to a self-balancing pressure ink cartridge. The self-balancing pressure ink cartridge is detachably mounted in a printer pre-provided with an air blowing device. The ink cartridge comprises a first housing and a second housing which are bonded to each other. Ink is accommodated in an ink chamber, wherein the ink chamber is defined by the first housing and the second housing.The first housing comprises a bottom shell, a blowing port, an ink outlet, a deformable cavity and a film. The blowing port and the ink outlet are arranged on the front surface of the bottom shell. The deformable cavity is arranged in the ink chamber. The film can deform in the deformable cavity as gas is blown into the air blowing port. The ink cartridge further comprises a pressure relief devicelocated between the deformable cavity and the external atmosphere. Even if the pressure of gas blown into the deformable cavity by the air blowing device of the printer is too large, the high-pressure gas does not generate an acting force on the air blowing device, so that the air blowing device of the printer is effectively protected.