The invention provides pneumatic elastic scissors, which comprises scissors hinged with each other; each scissor comprises a head and a handle; wherein the handle of one of the scissors is provided with an air cavity, the middle lower part of the handle are provided with air holes communicating with the air cavity and the outside, and the middle upper part of the handle extends to the other handleside to form an arc air cylinder, wherein the circular center of the air cylinder is the rotating shaft of the pneumatic elastic scissors, the arc air cylinder is communicated with the air cavity, anarc-shaped sliding rod fixed to the other handle is matched in the arc air cylinder, and a sliding plug matched with the arc air cylinder is arranged at the free end of the arc-shaped sliding rod; when the pneumatic elastic scissors are fully opened, the sliding plug moves to the outer end of the arc air cylinder, and the sliding plug moves to the inner end of the arc air cylinder when the pneumatic elastic scissors are completely closed. The pneumatic elastic scissors can automatically expand the heads during the cutting process, and the heads can be kept closed without any constraint component so as to facilitate the safe storage.