A method for controlling an insulin injection pump, a related control unit (200), and an injection pump (300). The control unit (200) comprises: an expected plasma insulin concentration value acquiring module (202), a current subcutaneous and interstitial insulin concentration value acquiring module (201), a supposed injection value acquiring module (203), an injection instruction sending module (204), and a counting module (205). The injection pump comprises a pump body and the control unit (200), and the control unit (200) is disposed in the pump body.