The invention discloses an automatic ceramic tile spacer placing device which comprises a tile inlet conveying belt and a tile outlet conveying belt which are arranged at intervals, wherein a spacer conveying belt used for bearing reclining spacers is arranged under the tile inlet conveying belt, and a transition plate used for bearing the spacers is arranged at the output end of the spacer conveying belt; a backup plate used for leaning against the spacers is arranged at the output end of the transition plate, and a jacking mechanism used for jacking a single spacer is arranged between the transition plate and the backup plate. The conveying belt for leaning against and stacking the spacers is arranged, and each spacer is jacked to the ceramic tile conveying belt through the jacking mechanism, is pressed at the bottom of the progressing ceramic tile, and is conveyed forwards to the next process along with the conveying belt. The automatic ceramic tile spacer placing device can automatically put the thin and crisp cheap foam spacer under the bottom surface of the ceramic tile, and the production cost of enterprises can be effectively reduced.