The invention relates to a performance testing device for actual water-distributing density. The device comprises a water collecting system, an ignition combustion system, an air supply system, a data acquisition control system and a water supply system, wherein the water collecting system, the ignition combustion system and the air supply system are installed on a mobile frame and combined as anintegral mobile unit; a control cable is connected to PLC (Programmable Logic Controller) and an industrial personal computer of the data acquisition control system through a concentrated junction box; the data acquisition control system is controlled by an upper industrial personal computer; and a programmable control relay contact of PLC starts up the ignition device for ignition, thus realizing automatic ignition of remote control, and automatic acquisition and processing of data. The device is compact in structure, small in floor area and high in degree of automation. The automatic data acquisition and processing of an ADD (actual delivered density) performance testing device is greatly improved. The device is suitable for the actual need of fire-fighting products for performance testand is of practicability and creativeness.