Sand mold core positioning tool, sand mold core combination method and aero-engine

The invention discloses a sand mold core positioning tool, a sand mold core combination method and an aero-engine. The sand mold core positioning tool comprises a sand box, and the top and the bottom of the sand box are open; the template is used for being arranged at the open end of the sand box and used for enabling the sand mold core to be located at one end of the template to form a positioning structure after the sand box is filled with molding sand; the positioning pin is vertically arranged at a preset position on the template; the sleeve component is used for being arranged on the positioning pin in a sleeving manner so as to be embedded in the sand mold core after molding sand is filled in the sand box; and the combined positioning piece is used for being arranged in the sleeve components of the sand mold cores in a penetrating manner when the sand mold cores are combined. According to the sand mold core positioning tool, the sleeve component is positioned through the positioning pin, so that the sle