The pet cage includes a base, a top net plate and a plurality of side net plates, wherein the side net plates are sequentially connected end to end to form a fence space, the bottom of the fence space is connected with the base, and the top of the fence space is connected with the top net plate; a connecting structures for connecting adjacent side net plates with each other are arranged between the adjacent side net plates, and the connecting structure includes a clamping hook arranged on one side net plate and a clamping tongue arranged on the other side net plate for clamping and locking the clamping hook. Therefore, the invention has the advantages of simple manufacturing process, quick and convenient installation, high connection strength, safety and reliability.