The invention discloses a multi-stage premixed pipe for a gas furnace head. The multi-stage premixed pipe a pipe body, a first gas inlet, a second gas inlet and a mixed gas outlet, one end of the pipebody is provided with the first gas inlet and the second gas inlet correspondingly, the other end of the pipe body is provided with the mixed gas outlet, the pipe body is fixedly connected with a fixed plate, and two cavities are formed in the inner part of the pipe body through the fixed plate, the side wall of the fixed plate is provided with a communicating port which is in the horizontal direction, the two ends of the pipe body communicate through the communicating port, one end of the inner part of the pipe body is fixedly provided with a first conduit, and a second conduit is arranged on the outer part of the first conduit in the pipe body, the outer side of the first conduit is equidistantly provided with a first exhaust port, the outer side of the second conduit is equidistantly provided with a second exhaust port, and the other end of the pipe body is provided with a guide rod. The premixed pipe realizes multi-stage mixing of gas, the overall structure is simple, the design is reasonable, the mixing effect of gas is good, the utilization rate of gas is improved, and it is convenient to popularize and use.