The invention provides an automatic spraying device for tubular hardware. The automatic spraying device comprises a spraying box and further comprises a spraying mechanism and a rotation mechanism which are arranged in the spraying box. The rotation mechanism is used for bearing a workpiece and driving the workpiece to rotate relative to the spraying mechanism. The spraying mechanism conducts spraying towards the rotation mechanism. The rotation mechanism comprises a rotation base arranged at the middle portion in the spraying box, a first drive mechanism driving the rotation base to rotate around the center of the rotation base, a plurality of rotation discs arranged on the rotation base and a plurality of second drive mechanisms. The multiple second drive mechanisms drive the corresponding rotation discs to rotate around the respective centers. When the rotation base rotates, all the rotation discs and all the second drive mechanisms are driven to rotate together. The automatic spraying device can conduct spraying on multiple pieces of tubular hardware at the same time, the work efficiency is improved, spraying of the surface of the tubular hardware can be achieved at a time in place, secondary spraying is avoided, and the work efficiency is effectively improved.