Resistance reduction agent for oil well fracturing and preparation method of resistance reduction agent

The invention provides a resistance reduction agent for oil well fracturing. The resistance reduction agent for oil well fracturing comprises components A and components B., and the ratio of the components A to the components B is 20:80. The components A comprise 25-37.5 parts of acrylamide, 5-50 parts of hydrophilic monomers, 2.5-10 parts of sodium hydroxide, 1.25 parts of persulfate and 150.25-215.25 parts of water. The components B comprise 450-880 parts of hydrophobic monomers, 100-400 parts of spans, 10-100 parts of alkylphenol ethoxylates and 10-50 parts of alcohol amine salt type anionic fluorocarbon surfactants. Raw materials of the resistance reduction agent are easy to obtain, the preparation technology is simple, water solubility is good, friction resistance is reduced by more than 60%, the interface tension is below 10-2 mN/m after gel breaking, when the resistance reduction agent is used, fast flowback can be achieved while no discharge adding agent needs to be added, and wide application prospects are achieved.