A tandem organic light-emitting diode, an array substrate and a display device are provided. The tandem organic light-emitting diode includes an anode (10), a hole transport layer (11), a first light-emitting layer (12), a first charge generation layer (13), a second charge generation layer (14), a third charge generation layer (15), a second light-emitting layer (16), an electron transport layer (17) and a cathode (18) which are sequentially laminated, wherein the first charge generation layer (13) is an N-type bulk heterojunction, the second charge generation layer (14) is a PN junction type bulk heterojunction, and the third charge generation layer (15) is a P-type bulk heterojunction. The array substrate includes a plurality of the above tandem organic light-emitting diodes and the display device includes the above array substrate. The tandem organic light-emitting diode provided herein can be applied in a display device for reducing power consumption.