Continuous spraying device and spraying method suitable for small-size building steel plates

The invention relates to the technical field of spraying, in particular to a continuous spraying device and method suitable for small-size building steel plates. The device comprises a conveying line, a steel plate containing tool, an image obtaining device, a clamping mechanism, a position regulating and controlling mechanism, a spraying mechanism and a processor. The multiple steel plate containing tools are connected with the conveying line so as to move in the conveying direction. The image acquisition device is arranged on the conveying line; the clamping mechanism is used for being connected to a fixing facility, the clamping mechanism is provided with a jacking assembly used for jacking the side face of a steel plate and a movable adsorption assembly used for adsorbing the side face of the steel plate, and the adsorption assembly is provided with a rotatable adsorption face and can be close to or away from the jacking assembly in the movable state; the position regulation and control mechanism is conne