Method and device for preparing low-sulfur petroleum coke

The invention relates to the field of low-sulfur petroleum coke production, and discloses a method and a device for preparing low-sulfur petroleum coke. The method comprises the following steps: (1) in the presence of a hydrogenation catalyst, carrying out hydrotreating on a wax oil raw material, and carrying out distillation cutting on the obtained product to obtain a light fraction and a heavy fraction; in the presence of a complexing agent, carrying out complexing desulfurization reaction on the residual oil raw material to obtain desulfurized residual oil; (2) under delayed coking reaction conditions, carrying out contact reaction on the heavy fraction and the desulfurized residual oil to obtain coker gas oil and low-sulfur petroleum coke; the method further comprises the following steps: carrying out catalytic cracking reaction on the light fraction to obtain propylene, catalytic cracking wax oil and oil slurry; and circulating the circulating material back to the step (1) for hydrotreating, the circulat