The invention discloses a whole-fraction crude benzene hydrogenation method and a catalyst, and belongs to the technical field of whole-fraction crude benzene processing. According to the whole-fraction crude benzene hydrogenation method, firstly crude benzene fraction at the temperature being higher than or equal to 70 DEG C and hydrogen sequentially pass through a micro-particle generator and a static mixer, the two raw materials are mixed to form uniform micro particles with the diameter of 0.1-20 microns, and the micro-particle-state raw material is hydrogenated to be sufficiently saturated in the presence of a low-temperature hydrogenation catalyst and under the conditions of the certain pressure, air speed and temperature so that the raw material is converted into a stable saturated compound; low-temperature hydrogenated oil is mixed with new hydrogen, recycle hydrogen and crude benzene fraction coming from a pre-fractionating tower and having a temperature being lower than 70 DEG C, and then the mixture is hydrogenated; the hydrogenated whole-fraction crude benzene generated oil is subjected to gas stripping and fractional distillation to obtain light arene fraction and heavy arene products; and finally a separation flow comprising pre-distillation, extraction and rectification is carried out to obtain purified petroleum benzene, methylbenzene and non-arene products. By virtue of the whole-fraction crude benzene hydrogenation method and the catalyst, the problem of coking in a process of high-temperature hydrogenation of whole-fraction crude benzene raw materials is solved, and the long-term circulation of the crude benzene hydrogenation device is realized.