The invention discloses a testing device for a multichannel substation noise comprehensive cloud picture. The testing device comprises a fixing disc which is mounted on a movable base through a pitching adjusting device, and a rail is arranged on the fixing disc. A floating disc is mounted on the rail, and a camera is arranged on the fixing disc. All array arms are hinged to the fixing disc, and each array arm is connected with the floating disc through a connecting rod. The two ends of the connecting rods are hinged to the array arms and the floating disc correspondingly, and a plurality of acoustic sensors are arranged on each array arm. The camera and signal outputting ends of all the acoustic sensors are both connected with a signal receiving end of a data collecting and processing device. The data collecting and processing device comprises a sensor plate, an FPGA, a power supply and an upper computer. The power supply is connected with the FPGA connected with the upper computer. Through to-be-detected areas traversing a whole substation, noise positioning of the whole substation can be completed, and the noise comprehensive cloud picture of the whole substation can be obtainedby splicing noise testing images of all detecting points.