The invention provides a high-voltage direct current power transformation converter valve phase change failure resistance device, which comprises a thyristor state monitoring unit, a transmission channel and an upper layer control unit, wherein the thyristor state monitoring unit monitors the operation parameters of a thyristor in real time, and sends the parameters to the upper layer control unit through the transmission channel; the upper layer control unit generates the phase change failure information of a single valve according to the thyristor operation parameters transmitted by the thyristor state monitoring unit of the same single valve in converter valves; a direct current control protection system executes the corresponding control logics according to the phase change failure information. Compared with the prior art, the high-voltage direct current power transformation converter valve phase change failure resistance device provided by the invention has the advantages that the phase change failure of the converter valve can be fast judged in 1.5ms; the capability of the converter valve for resisting the phase change failure is enhanced.