The invention discloses a vertical low-nitrogen pulverized coal organic heat carrier boiler which comprises a burner, a lower part radiation section pipe manifold, an upper part radiation section pipe manifold, a connecting pipe, a hearth, a tertiary air pipe, a roof pipe manifold, an explosion door, a hearth smoke outlet, an access door, a high-low temperature convection bank, ash falling pipes, slag extractors, a longitudinal channel, a high-temperature air preheater, waste heat equipment, a low-temperature air preheater and a dust collector, wherein the hearth is internally provided with the lower part radiation section pipe manifold, the upper part radiation section pipe manifold and the roof pipe manifold; the high-low temperature convection bank is arranged in the longitudinal channel communicated with the hearth smoke outlet; the high-low temperature convection bank, and the connecting pipe, the lower part radiation section pipe manifold, the upper part radiation section pipe manifold and the roof pipe manifold are sequentially communicated to form a closed heating medium circulation system. Heating surfaces are arranged in the whole hearth, so that a noncoking state can be ensured at nominal output. In addition, the burning is uniform, the temperature difference between the front and back is low, so that the reduction of the content of NOx can be facilitated. The connecting pipe is arranged outside the hearth, and is free from heat, so that heat transfer oil can be prevented from being gasified.