The invention discloses a double-impeller self-rotation type fireproof mixer. The double-impeller self-rotation type fireproof mixer comprises a three-way joint, wherein the three-way joint comprises a mixing pipe and a connecting pipe which are communicated with each other; the two ends of the mixing pipe are communicated with a grouting pipeline; the connecting pipe is communicated with a nitrogen injecting pipeline or a glue injecting machine; two impellers are connected in the mixing pipe in a relative-rotation manner and are respectively positioned at the two sides of the connecting point of the connecting pipe and the mixing pipe; a check valve is communicated on the connecting pipe in a sealed manner; two impeller fixing frames are fixedly connected in the mixing pipe in a front-rear corresponding manner, and are fixedly connected with impeller shafts, and the impellers are arranged on the impeller shafts in a relative-rotation manner; the distance from the connecting point of the connecting pipe and the mixing pipe to the far end of the mixing pipe is 5-8 times of that from the connecting point of the connecting pipe and the mixing pipe to the near end of the mixing pipe; the distance from the impeller positioned at the far end of the mixing pipe to the connecting point of the connecting pipe and the mixing pipe is 7-12 times of that from the impeller positioned at the near end of the mixing pipe to the connecting point of the connecting pipe and the mixing pipe; a grouting pipe communicated with the grouting pipeline is fixedly communicated with the two ends of the mixing pipe in a sealed manner.