The present invention relates to an insulin pump having triple functions for the efficient regulation of a blood glucose concentration and an insulin injection system comprising the same. The insulin pump comprises an insulin syringe into which an insulin is stored, a pump to pressurize the insulin syringe in response to a programmed control signal, a control device that generates the programmed control signal to control the pump, a mode selection button to determine an insulin injection mode, and an operating button to command an insulin injection. The insulin injection mode is comprised of a base mode that continuously infuses the insulin at a basic rate to control a blood glucose concentration at a fasting, a food mode that infuses the insulin at a bulk to control the blood glucose concentration after food intake, and an activation mode that infuses the insulin in pulses for a predetermined time period. Preferably, the insulin pump complementarity cooperates with a physiological saline syringe pump that infuses physiological saline solution immediately after the infusion of the insulin at the activation mode.