The invention provides a measurer for the cervical trunk length of a femoral stem. The measurer comprises a simulated femoral stem body, a telescopic simulated femoral stem cervical trunk and a simulated femoral stem bulb, wherein the simulated femoral stem body is provided with a free end and a cervical trunk connecting end, the first end of the telescopic simulated femoral stem cervical trunk is connected to the cervical trunk connecting end, the simulated femoral stem cervical trunk is provided with a measuring range reader used for measuring the telescoping degree, and the simulated femoral stem bulb is arranged at the second end of the simulated femoral stem cervical trunk. The measurer for simulating the cervical trunk length of the femoral stem is provided with the simulated femoral stem body and the telescopic simulated femoral stem cervical trunk, and the simulated femoral stem cervical trunk is provided with the measuring range reader used for measuring the telescoping degree so as to determine the cervical trunk length of the femoral stem. The measurer for the cervical trunk length of the femoral stem enables a medical worker to accurately determine the cervical trunk length of the femoral stem and indicates the matched cervical trunk length, suitable for the physiological structure of the human body, of the femoral stem.