The present invention relates to artificial feed for the mass culture of long-horned beetles, to a method for manufacturing the artificial feed, and to a method for breeding long-horned beetles using same. The artificial feed for long-horned beetles according to the present invention contains oak powder irradiated with microwaves, and thus improves the initial development of larvae, decreases the larval age gap between hatched larvae and full-grown larvae, and improves the larval survival rate by increasing resistance to pathogenic bacteria and the like. In other words, according to the present invention, long-horned beetles which normally cannot be artificially bred can be bred year-round, and long-horned beetles can be bred in large quantities by increasing the larval survival rate and emergence rate.