Dual-cavity automatic syringe

The utility model relates to a medical automatic injector with two cavities, and the medical automatic injector with the two cavities is composed of an emission part and an injection administration part. The emission part is provided with a top cap, an emission outer sleeve, a safety ring, a spring seat, a spiral spring and a push rod. The injection administration part is provided with an injection outer sleeve, a chain, a medicine pipe bolt, a needle head, a medicine pipe with two compartments, a toothed knife for the medicine pipe, a U-shaped steel wire and a silicon rubber piston. The utility model has the advantages that volume size is rational, a user can automatically reassemble the utility model without tools, and injection success ratio is high. The utility model is suited to be used when a person urgently needs to inject two kinds or more than two kinds of medicines into the self body for some reasons to self rescue and mutually rescue, and stability of the medicines is lowered after the medicines are mixed.