A multifunctional detector includes a body (20), a test specimen insertion slot (30), a mode selection unit (40) and a processor (50) to test a test specimen (10A,10B,10C,10D) which includes a working electrode (11), a reference electrode (12) and at least one identification pin (13). The working electrode, reference electrode and identification pin are located at one end of the test specimen in a juxtaposed manner. The identification pin includes multiple sets electrically connecting with the working electrode to form multiple detection modes to test different physiological signals. After the test specimen is inserted into the test specimen insertion slot, the processor reads and gets the potential of the working electrode and identification pin to identify electric connection state between them and control the mode selection unit to select a corresponding detection mode to perform detection through the test specimen. Thus the detection modes of the test specimen can be indentified and selected automatically to improve usability, and also prevent erroneous selection of the detection modes to result in false detection of physiological signals to harm users health.
