Crude oil conveying pipeline system

The utility model discloses a crude oil conveying pipeline system and a crude oil conveying method thereof. A crude oil conveying pipeline comprises an outer pipe and an inner pipe. The inner pipe is arranged in the outer pipe in a sleeved mode. The inner pipe is filled with crude oil. A locating block is added between the inner pipe and the outer pipe. A sealed cavity is formed between the inner pipe and the outer pipe. The cavity is filled with high-pressure liquid or high-pressure gas. A plurality of rotational flow holes are formed in the wall of the inner pipe from the outer surface to the inner surface. The rotational flow holes are communicated with the inner pipe and the cavity. During a crude oil conveying process, the high-pressure liquid or the high-pressure gas in the cavity forms an even and stable conveying medium layer on the inner wall face of the inner pipe after passing through the rotational flow holes, crude oil is wrapped, direct contact of the crude oil and the inner pipe is avoided, the