The application relates to a paper box production equipment field, in particular to a
paperboard automatic feeding device, which comprises a feeding mechanism, the bottom of the falling
paperboard is pushed by a pushing piece, the falling
paperboard is pushed over to the feeding mechanism, the degree of
automation is improved, and the production efficiency is improved; due to the
friction force between the adjacent paperboards, part of the paperboards is suspended in the air when falling in the vertical direction
static friction with the front and rear paperboards; when the pushing piece pushes over the front paperboard, the part of the paperboard loses the
friction force and falls to the upper side of the supporting strip and keeps the vertical state; in the retracting process of the turning-over mechanism, the rear side of the pushing piece abuts against the front side of the frontmost paperboard, then the pushing piece is turned over downward along the
hinge joint of the inclined block and the U-shaped block in the continuous retracting process, then passes through the lower side of the part of the paperboard, and the pushing piece is turned over upward and reset by the pulling force of the tension spring after passing through the part of the paperboard, so that the paperboard is prevented from being pressed and bent, and the production reliability is improved.