The invention discloses a partial discharge detection device, which comprises a UHF antenna sensor, an RF bandwidth amplifier, a narrowband resonant anti-aliasing filter and a digital acquisition circuit, wherein the UHF antenna sensor is used for acquiring UHF partial discharge signals; the RF bandwidth amplifier is connected with the UHF antenna sensor, and is used for carrying out bandwidth amplification on the UHF partial discharge signals and converting the UHF partial discharge signals into UHF partial discharge differential signals; the narrowband resonant anti-aliasing filter is connected with the RF bandwidth amplifier, and is used for calculating central resonant frequency and narrowband frequency width and controlling the UHF partial discharge differential signals to be positioned in a target order sampling region according to the central resonant frequency and the narrowband frequency width; and the digital acquisition circuit is used for aliasing frequency spectra of the UHF partial discharge differential signals in the target order sampling region to a baseband sampling region, and an impedance matching circuit is arranged between an input end of the digital acquisition circuit and an output end of the narrowband resonant anti-aliasing filter. The partial discharge detection device solves the technical problem that the partial discharge detection sensitivity is low in the prior art.