The invention discloses an automatic center adjusting coal blocking device of a fully-mechanized face reversed loader handpiece. The device comprises a reversed loader handpiece rack, coal blocking plates are movably connected to the ends of two sides of the reversed loader handpiece rack respectively, and a center adjusting component which adjusts the coal blocking plates to swing up and down andleft and right is connected onto each coal blocking plate; up-down adjusting components are connected to the bottoms of the coal blocking plates, and a buffer plate is movably connected to the portion between the connection ends of a pair of coal blocking plates and the reversed loader handpiece rack. According to the automatic center adjusting coal blocking device of the fully-mechanized face reversed loader handpiece, the coal blocking plates swing up and down and left and right through the center adjusting component, and meanwhile it is guaranteed that the buffer plate can rotate along with the coal blocking plates through movable connection. The automatic center adjusting coal blocking device of the fully-mechanized face reversed loader handpiece solves the problem that the coal blocking plates cannot be automatically adjusted according to requirements in the prior art.