The invention discloses manufacturing equipment of back-sided crossed dovetail grooves of tiles and a manufacturing method of the back-sided crossed dovetail grooves of the tiles. The manufacturing method comprises the following steps: mutually and cooperatively performing compression molding on tile blank bodies by adopting two large components including a tile blank body molding surface pressingstand and a tile blank body back pressing stand; configuring a layer of movable inclined-edge molding plate in the tile blank body back pressing stand to perform compression and die carving on the back sides of the tile blank bodies; forming crossed oblique post openings formed by crossed mounting tile molding teeth on the back sides of the tiles and then combining the crossed oblique post openings to form the crossed dovetail grooves. The tile blank body molding surface pressing stand prepared by the invention comprises the inclined edge molding plate, the back pressure stressed bedplate anda tile die-compression back pressure plate, wherein prestressed compression fixed columns are formed between the back pressure stressed bedplate and the tile die-compression back pressure plate; a stressed structure adopts a linkage type combination form, compression on back-pattern crossed type dovetail grooves of the tile blank body can be carried out in one pultruded stroke; the back patternsof the prepared tile blank body are crossed into inclined columns and the inclined columns are combined into the crossed dovetail grooves.