Oil field crude oil pour point depressant and preparing method thereof

The invention belongs to the technical field of oil-gas-water collecting and transporting and discloses an oil field crude oil pour point depressant and a preparing method of the oil field crude oil pour point depressant. The preparing method includes the steps that acrylic ester or metacrylic acid ester is mixed with perfluor carboxylic ester firstly, an organic solvent is added, the temperature rises, and stirring is conducted; then styrene is added, the temperature rises under the nitrogen protection, an organic solvent solution of an initiator is dripped, and a product A is obtained after a reaction; and finally, a-olefin, a polymer B and the product A are mixed and evenly stirred, and the oil field crude oil pour point depressant is obtained. The oil field crude oil pour point depressant has the paraffin prevention pour point depressing function, does not contain chlorine, is very suitable for transporting of crude oil of an offshore oil field and has the characteristics that the dosage is small, and the pour point depressing amplitude is large. The preparing method of the oil field crude oil pour point depressant is simple, a polar group containing fluorine is directly introduced into a molecular chain through a further reaction, the reaction process is easy to control, safe, reliable and environment-friendly, and high general applicability is achieved.