The invention discloses a power tube drive method and a power tube drive circuit. The power tube drive method and the power tube drive circuit are applied to a direct-current solid power controller. The power tube drive circuit comprises a charging and discharging constant current source, a corresponding control switch, a not gate, and a feedback capacitor connected between the grid electrode and the drain electrode of a power tube in a bridging mode. In the turning on and turning off process of the direct-current solid power controller, the constant current source is controlled to charge and discharge the feedback capacitor, and the feedback capacitor feeds voltages of the drain electrode and the source electrode of the power tube back to the power grid electrode. The invention further discloses the direct-current solid power controller comprising the power drive circuit. According to the power tube drive method and circuit, and the direct-current solid power controller, the power tube can be turned on and turned off at a low and constant switching speed, load voltages are increased or decreased in a linear mode, and the rate of increasing and decreasing is adjustable. The power tube drive method and the power tube drive circuit are suitable for conventional Si MOSFETs and IGBTs, and also are suitable for Sic and GaN field control type power tubes like JFETs, MOSFETs and IGBTs. The drive circuit is simple and reliable, easy to integrate, and low in cost.