Provided is a firework, belonging to the technical field of firework articles. The firework solves the problems in the art of the complex mounting and high cost of a firework. The firework comprises an outer barrel and an inner barrel, wherein a mounting hole is provided in the outer barrel, with one end of the mounting hole being open, and the other end thereof having a bottom face; the inner barrel is arranged inside the mounting hole, with an outer side wall of the inner barrel and/or a hole wall of the mounting hole being provided with protruding positioning members, and the inner barrel is connected inside the mounting hole of the outer barrel by means of the positioning members; and a pressurized air chamber is provided between the inner barrel and the bottom face. In the present utility model, an inner barrel is directly connected to an outer barrel by means of providing positioning members integrated with the outer barrel or the inner barrel, such that not only are positioning and connection of the inner and outer barrels directly realized, but also a pressurized air chamber is directly formed when the inner barrel is mounted inside a mounting hole of the outer barrel, thereby simplifying a connecting structure for the inner and outer barrels and the process for forming the pressurized air chamber, and saving on substantial mounting costs.
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