High-temperature high-pressure resistant concentric two-way rotary joint

The invention discloses a high-temperature high-pressure resistant concentric two-way rotary joint which comprises a gas-in seat and an outer sealing cylinder, wherein one end of the outer sealing cylinder is clamped on a sealing cylinder cover of the gas-in seat; a sealing ring is also arranged between the outer sealing cylinder and the sealing cylinder cover; a raised butt-joint cylinder is arranged at the middle of the gas-in seat; an inner gas-in pipe is arranged at the gas-in end of the butt-joint cylinder through a gas-in joint; an outer guide cavity is formed between the periphery of the butt-joint cylinder and the outer sealing cylinder; an outer gas-out pipe communicated with an outer backflow cavity is arranged on the side wall of the outer sealing cylinder through the gas-in joint; the gas-out end of the butt-joint cylinder is in contact with a gas-out butt-joint pipe through an inner graphite sealing ring; and the inner graphite sealing ring is positioned in an inner graphite ring groove of the bu