The invention discloses a method for preparing catalytic thermal cracking raw materials from full-fraction shale oil, relates to a full-fraction shale oil deep processing process, and aims to solve the technical problems of 'more money on exhibit and less money on counterfoil' and insufficiency in 'oil-chemical' combination degree of the current oil shale industrial structure in the conventional method. The method is conducted in the following units: 1, a raw material pretreatment unit; 2, an atmospheric distillation unit; 3, a reduced pressure distillation unit; 4, a hydrotreating unit; 5, a product fractional distillation unit. According to the method, the utilization ratio of the shale oil resource is effectively increased; the main product is hydrofined wax oil used as the raw material for a follow-up catalytic thermal cracking device; the by-products are high-value LPG, hydrogenated petroleum naphtha and hydrogenated diesel oil; light shale oil (lower than or equal to 350 DEG C) and residual oil (higher than 500 DEG C) which are thrown away from the process device can be further processed and utilized in a downstream device. The method belongs to the field of full-fraction shale oil deep processing.