A bypass thyristor valve group inspection method for inspecting sub-modules in a bypass thyristor valve group, comprising: dividing, by valve group control unit, the bypass thyristor valve group into N sub-modules, wherein N is greater than or equal to 2, N is a natural number, and each sub-module is formed by one thyristor or by connecting two or more thyristors in series; under the condition that the bypass thyristor valve group bears a forward voltage during normal operation, sequentially triggering, in conjunction with a valve-based electronic unit, the sub-modules according to a certain time period; and detecting whether the sub-modules are capable of operating normally or not, and if not, sending an alarm signal, wherein the bypass thyristor valve group further comprises a thyristor control unit, and the inspection method further comprises: receiving, by the thyristor control unit, a trigger pulse of the valve-based electronic unit; sending, by the thyristor control unit, the thyristor-born forward voltage signal to the valve-based electronic unit; and sending, by the thyristor control unit, the thyristor turn-on signal to the valve-based electronic unit, wherein the thyristor control unit further comprises a powering loop and a resistance-capacitance discharge loop; the powering loop at least comprises two static voltage-sharing resistors and an energy storage capacitor, and before the thyristor is turned on, enough energy can be obtained to ensure the normal turn-on of the thyristor; and the resistance-capacitance discharge loop at least comprises a resistor and a capacitor which are connected in series, and after the thyristor is turned on, enough energy can be obtained to ensure the normal conduction of the thyristor. dividing, by valve group control unit, the bypass thyristor valve group into N sub-modules, wherein N is greater than or equal to 2, N is a natural number, and each sub-module is formed by one thyristor or by connecting two or more thyristors in series; under the condition that the bypass thyristor valve group bears a forward voltage during normal operation, sequentially triggering, in conjunction with a valve-based electronic unit, the sub-modules according to a certain time period; and detecting whether the sub-modules are capable of operating normally or not, and if not, sending an alarm signal, wherein the bypass thyristor valve group further comprises a thyristor control unit, and the inspection method further comprises: receiving, by the thyristor control unit, a trigger pulse of the valve-based electronic unit; sending, by the thyristor control unit, the thyristor-born forward voltage signal to the valve-based electronic unit; and sending, by the thyristor control unit, the thyristor turn-on signal to the valve-based electronic unit, wherein the thyristor control unit further comprises a powering loop and a resistance-capacitance discharge loop; the powering loop at least comprises two static voltage-sharing resistors and an energy storage capacitor, and before the thyristor is turned on, enough energy can be obtained to ensure the normal turn-on of the thyristor; and the resistance-capacitance discharge loop at least comprises a resistor and a capacitor which are connected in series, and after the thyristor is turned on, enough energy can be obtained to ensure the normal conduction of the thyristor. receiving, by the thyristor control unit, a trigger pulse of the valve-based electronic unit; sending, by the thyristor control unit, the thyristor-born forward voltage signal to the valve-based electronic unit; and sending, by the thyristor control unit, the thyristor turn-on signal to the valve-based electronic unit, wherein the thyristor control unit further comprises a powering loop and a resistance-capacitance discharge loop; the powering loop at least comprises two static voltage-sharing resistors and an energy storage capacitor, and before the thyristor is turned on, enough energy can be obtained to ensure the normal turn-on of the thyristor; and the resistance-capacitance discharge loop at least comprises a resistor and a capacitor which are connected in series, and after the thyristor is turned on, enough energy can be obtained to ensure the normal conduction of the thyristor.