An electrostatic discharge (ESD) circuit, an array substrate and a display device are provided. The ESD circuit including a first signal line, a second signal line and a first thin film transistor (TFT), wherein the first TFT includes a plurality of first sub-TFTs; each first sub-TFT includes a first source electrode and a first drain electrode; the first sub-TFTs are sequentially arranged; adjacent first sub-TFT share one first source electrode or first drain electrode; one of the first signal line and the second signal line is electrically connected with the first drain electrode of each first sub-TFT; and the other is electrically connected with the first source electrode of each first sub-TFT.