The present invention relates to an expanded polypropylene foam-forming mold including: a core mold (110) having a plurality of core forming portions formed thereon, a guide groove (114) formed between the neighboring core forming portions, and a gate (116) formed on the bottom surface of the guide groove and having blade portions (116a) formed at both side edges thereof; and a cavity mold (120) having a plurality of cavity forming portions to be combined with the plurality of core forming portions (122) and a filler gun insertion hole (124) formed between the neighboring cavity forming portions, wherein when the core mold is combined with the cavity mold, the outer peripheral surface of a filler gun (126) coupled to the filler gun insertion hole is inserted into the guide groove.