The present invention relates to a light emitting accessory for a portable terminal and an accessory light emitting system for a portable terminal, and to a light emitting accessory for a portable terminal, which is detachably coupled to the portable terminal to emit light using light of a flash of the portable terminal based on an external signal, a location of the portable terminal, and the like, and an accessory light emitting system for a portable terminal. A light emitting accessory for a portable terminal according to the present invention includes: a fixing unit that is detachably coupled to a portable terminal to cover a flash that is formed on a rear surface of the portable terminal; and a light emitting unit that receives light of the flash from the fixing unit to emit light.