The invention discloses a differential ring lightning current sensor based on a printed circuit board and digital integration. The differential ring lightning current sensor comprises an upper shielding case 2, a lower shielding case 3 and a printed circuit board differential ring 4. The upper shielding case 2 and the lower shielding case 3 are matched to form an airtight hollow case. The printed circuit board differential ring 4 is arranged in the cavity of the hollow case and comprises a substrate, a spiral coil formed in an etching mode is arranged on the substrate, and the two ends of the coil are led out of the hollow case through wires 6 respectively. By means of the printed circuit board differential ring based on the Faraday's law of electromagnetic induction, non-contact measurement can be achieved, the waveform of a lightning current in a power transmission line can be accurately measured, full-wave parameters of the lightning current can be measured, the measurement accuracy is high, the cost is low, and volume production can be achieved.