In order to facilitate the ignition of the gas discharge plasma, a high open circuit voltage is required to drive the constant current source. At the same time, because of the negative resistance effect of gas discharge, the voltage required to maintain the discharge after ignition is far less than the ignition voltage, and the surplus voltage after ignition will result in a large power consumption of the constant-current source. In view of this, a circuit scheme to reduce power consumption of a constant current source for glow-discharge drive is proposed, and its working principle is analyzed in detail. In this scheme, a constant current source with an open circuit voltage slightly higher than the maintenance voltage of gas discharge is used to reduce power consumption, and a high-voltage pulse piezoelectric ceramic is used to ensure reliable ignition of gas discharge. The constant current source and the high-voltage pulse circuit work in parallel after being isolated by high-voltage silicon stack. Experimental results show that when the circuit works normally, the power consumption can be reduced by about 50%. The sample precision test of the galvanized sheet is carried out on the direct current glow discharge experimental platform, and it is found that the relative standard deviation (RSD) of the test results of Cu, Si, and Mo contents (spectral line intensity) are all greater than 2%.