The utility model discloses a direct current inhibition apparatus of a transformer neutral point. The direct current inhibition apparatus comprises: a direct current blocking capacitor connected between the transformer neutral point and the ground; a fast-closing switch, connected in parallel with the direct current blocking capacitor; a rectifier bridge, wherein an input end of the rectifier bridge is connected with two ends of the direct current blocking capacitor, and an AC voltage of the transformer neutral point is transformed to a DC voltage and outputted to a trigger module; the trigger module, wherein an output end of the trigger module is connected with a trip coil of the fast-closing switch. The trigger module detects the value of the voltage outputted by the rectifier bridge in real time, when an overvoltage is detected, the trip coil obtains power through triggering, then a normally open contact of the fast-closing switch fast closes. And then the direct current blocking capacitor is short circuited by the fast-closing switch. The transformer neutral point is in ground connection through the fast-closing switch and automatically quits the direct current blocking capacitor. The direct current inhibition apparatus of the utility model can prevent the direct current from flowing into the AC transformer, so as to not only protect the transformer neutral point, but also protect the capacitor of the apparatus. The direct current inhibition apparatus enhances the reliability of the apparatus, and prevents an accident of an electrical network from being further enlarged.