The invention discloses an air travelling case used for a pet. The air travelling case comprises a pet case body and a case body storage bag cooperated with the pet case body. The pet case body comprises an outer casing and a bearing plate installed on the bottom of the outer casing. The top of the outer casing is provided with a folding handle. The outer casing is also provided with a spring switching door. The upper surface of the bearing plate is also provided with an isolation base plate. The case body storage bag is sleeved on the periphery of the pet case body. Through the above method, the air travelling case used for a pet is exquisite in structure, convenient and easy in dismounting, and easy in carrying. The air travelling case used for a pet is suitable to be used for long journey of a pet, and ensures comfortableness of the pet during long-time flight, and ensures safety of the pet.