The utility model provides a firing pin assembly, which relates to the field of landing equipment for aircrafts and comprises a firing pin body, a pin seat and a pin rod. Wherein the firing pin body is connected with one end of the pin seat, the pin rod is connected with the other end of the pin seat, an air duct arranged in the axial direction and an air guide duct communicated with the air ductin the radial direction are arranged in the firing pin body, and the air duct penetrates through a pin point of the firing pin body. When the needle tip of the firing pin body impacts the bottle opening end of the gas storage bottle, part of compressed gas is led out of the firing pin body through the gas channel and the gas guide channel, the pressure of part of gas is released, and therefore thepressure released by the compressed gas on the firing pin body is reduced, and the needle tip of the firing pin body can break through the bottle opening end of the gas storage bottle more smoothly.The air in the air storage bottle can be discharged at a time, the air flow is increased, and the ejection force requirement for the parachute is met.