Disclosed herein is a sonobuoy cartridge percussion apparatus. A sonobuoy cartridge percussion apparatus according to an aspect of the present invention includes: a CO2 cartridge filled with CO2 gas; a percussion ram configured to hit one end of the CO2 cartridge; a spring configured to enable the percussion ram to hit the CO2 cartridge by applying force to the percussion ram; a CO2 cartridge fastening body configured such that a spring reception hole is formed therein to enable the spring to be compressed and inserted into the spring reception hole; and a thread-shaped fastening member configured such that one end thereof is wound around the percussion ram and the other end thereof is passed through the spring reception hole, wherein the fastening member compresses the spring, and is fastened to a stop protrusion formed on the CO2 cartridge fastening body.