A detecting apparatus for head physiological parameters is applied to a user. The detecting apparatus includes a first electrode, a second electrode, a physiological signal amplifying unit, an analog-to-digital converting unit, a signal separating-processing unit, a feature extraction unit, a decision unit, and a three-axis sensing unit. The physiological signal amplifying unit includes an instrument amplifier circuit, a feedback circuit, and an interior virtual grounding circuit. The detecting apparatus can detect the users physiological signal and head moving signal, and derive an EEG signal, an EOG signal, an EMG signal, and an ECG signal from the users physiological signal.
