The utility model relates to a blackwater angle valve pipeline of a coal gasification process flash system. Two sets of tower inlet blackwater angle valve pipelines are arranged on the same plane, pipes are in one-to-one correspondence, and structures are symmetrical relative to a tower body; one set of tower inlet blackwater angle valve pipeline comprises a shunting tee, a ball valve, an angle valve, a tower inlet tee, a buffer pipe and a blind flange, wherein a lower end opening of the shunting tee is connected with a liquid inlet pipe, a left end opening of the shunting tee is connected with one end of the ball valve, the other end of the ball valve is connected with one end of the angle valve, the other end of the angle valve is connected with an end opening of a straight pipe section of the tower inlet tee, the other end opening of the straight pipe section of the tower inlet tee is connected with one end of the buffer pipe, the blind flange is installed on the other end of the buffer pipe, an end opening of a vertical pipe section of the tower inlet tee is connected with the tower body, the pipes on one side of a right end opening of the shunting tee are in one-to-one correspondence to the pipes on one side of the left end opening of the shunting tee, and the structures are eudipleural relative to the shunting tee. The blackwater angle valve pipeline has the beneficial effects that the vibration of a piping system and equipment is obviously reduced, erosion behind the angle valve is reduced and delayed, and the thickened blind flange is convenient to replace.