An all-weather power frequency electric field measuring device comprises at least one power frequency electric field probe unit, a support and a handset. The probe unit is supported by the support, and the handset is connected with the power frequency electric field probe unit. The all-weather power frequency electric field measuring device is characterized in that a sensor of the power frequency electric field probe unit is a monopole grounding type capacity coupling senor, a physical double-layer structure or a single-face annular structure is adopted, and a high input impedance in-phase amplification circuit is adopted as a sensor output signal processing circuit. The upper-layer output end of the monopole grounding type capacity coupling sensor of the physical double-layer structure is connected with the signal input end of the high input impedance in-phase amplification circuit, and the lower-layer output end of the monopole grounding type capacity coupling sensor of the physical double-layer structure is directly connected with the ground. The single-face annular layer output end of the monopole grounding type capacity coupling sensor of the single-face annular structure is connected with the signal input end of the high input impedance in-phase amplification circuit, and the capacity coupling sensor is formed relative to the ground. The all-weather power frequency electric field measuring device can be convenient to use, effective and accurate, is simpler than an existing drying and moistureproof method and equipment, and is convenient to use.