A portable drug injection device using elastic force and osmotic pressure of the present invention comprises: a housing in which a first partition dividing an inside space into an inner space and an outer space, and a second partition dividing the inner space divided by the first partition into an inner space and an outer space, wherein the first partition and the second partition are made of an elastic material a first port which communicates with the outer space divided by the first partition of the housing and a third port which communicates with the inner space divided by the second partition of the housing. Further, the housing comprises: a first storage unit which corresponds to the outer space of the first partition, and stores a solvent or solution injected from the outside through the first port a second storage unit which corresponds to the outer space of the second partition, and stores a solvent or solution having a higher concentration than the solvent or solution stored in the first storage unit and a third storage unit which corresponds to the inner space of the second partition, and stores a drug injected from the outside through the third port. Additionally, a semipermeable membrane is disposed in the form of a porous membrane on one side of the first partition to selectively pass solvents and solutes within the solution stored inside the first storage unit and the second storage unit. According to the present invention, the portable drug injection device can provide a high injection pressure and maintain a uniform injection pressure by adjusting injection pressure of drug injected to a body by using osmotic pressure due to difference in concentration between the solvents and the solutions as well as the elastic force due to being made of the elastic material.COPYRIGHT KIPO 2017본 발명의 탄성력 및 삼투압을 이용한 휴대용 약물주입기는, 내부 공간을 내측 및 외측으로 분획하는 제1격벽 및 상기 제1격벽에 의해 분획된 내측 공간을 내측 및 외측으로 분획하는 제2격벽이 탄성재질로 마련되는 하우징 상기 하우징의 제1격벽에 의해 분획된 외측 공간과 연통되는 제1포트 및 상기 하우징의 제2격벽에
