Two-stage hydrogenation method for producing low freezing point motor fuel

The present invention relates to a two-stage hydrogenation method for producing a low freezing point motor fuel. The method is characterized in that a biological oil is adopted as a raw material oil; under a hydrogenation condition, the raw material oil and hydrogen are mixed, and pass through a first stage hydrogenation reaction zone; the stream generated from hydrogenation is separated to obtain hydrogen-rich gas; the hydrogen-rich gas is recycled at the first stage; the separated liquid enters a second stage hydrogenation modification reaction zone; the sub-hydrogen gas separated from the oil generated through second stage hydrogenation is recycled at the second stage circulation; and the separated liquid product is subjected to fractionation to obtain naphtha and low freezing point diesel oil, wherein hydrogenation activity components of the hydrogenation catalyst used at the first stage are one or a plurality of materials selected from sulfurization state W, Mo, Ni and Co and hydrogenation activity components of the hydrogenation catalyst used at the second stage are one or a plurality of materials selected from reduction state W, Mo, Ni and Co under a reaction state. Compared to the method in the prior art, the two-stage hydrogenation method of the present invention has the following characteristics that: the low freezing point motor fuel can be produced, activity stability of the catalyst can be ensured, and stable and long period device operation can be ensured.