The invention relates to a voltmeter and a voltmeter pen special for protecting a pressure plate and belongs to the technical field of electric power detection devices. According to the technical scheme, a data collecting module (12), an analog-digital conversion module (13), a single-chip microcomputer (14), a function self-detection module (15), a data display module (16) and a voice broadcasting module (17) are arranged in the voltmeter (1). A voltmeter display screen (2), a horn (3), a self-detection button (4), a power switch (5), a voltmeter pen negative electrode jack (6) and a voltmeter pen positive electrode jack (7) are arranged on the outer surface of the voltmeter. According to the voltmeter and the voltmeter pen special for protecting the pressure plate, the defects that when an existing universal meter is used for measuring the voltage across the two ends of the pressure plate, a wrong gear may be used, a grounding point is not easily fixed, reading is not easily observed and functions cannot be detected to be normal or abnormal are overcome, error tripping factors are reduced, the automatic detection function of the voltmeter is added, the voltmeter voice broadcasting function is added, and due to the fact that the structure of the voltmeter pen is improved, the number of measuring personnel can be reduced.