The invention provides a high-temperature flame-retardant combined valve control system for an accident oil discharge pipeline of an ultra-high-voltage transformer, and relates to the technical fieldof power systems. A pipeline comprehensive control mechanism and a one-way valve are arranged to achieve the barrier of an oil discharge pipe at a low oil level and passage opening for oil dischargingat a high oil level, thereby achieving the management and control of the oil level in the oil discharge pipe; the communication of the pipeline is achieved by rotating a valve in an annular cross section of the oil discharge pipe leftward and rightward around an axis; an oil discharging passage of the transformer is a circular tube, so that when transformer oil flows, an oil layer at the upper layer of an oil pool is prevented from igniting and entering the pipeline, thereby reducing the spread of fire, and an external adjacent oil pool is prevented from being in series connection with the oil pool in the opposite direction; the structure is arranged more reasonably and more safely; a filter net is arranged to be used for filtering the transformer oil flowing out of the ultra-high-voltagetransformer to prevent impurities in the transformer oil from flowing out to block a rear valve body and pipeline, so that the arrangement is more reasonable.