Oil displacement agent for fracturing as well as preparation method and application thereof

The invention discloses an oil displacement agent for fracturing as well as a preparation method and application thereof, wherein the oil displacement agent comprises the following components in percentage by weight: 47.7-64.3 wt% of polyethylene glycol, 52.1-35.2 wt% of long-chain sulfonic acid and 0.2-0.5 wt% of a catalyst. When the oil displacement agent and fracturing fluid are injected into an oil well together, the fracturing performance of the fracturing fluid cannot be affected, but the thickening performance of the fracturing fluid can be enhanced due to the fact that the oil displacement agent is a nonionic surfactant and has aggregation performance; after the oil displacement agent is injected into the oil well, the oil displacement agent can be hydrolyzed into an ionic-nonioniccompound surfactant under the influence of a high-temperature environment in a well, so that the oil displacement effect of the oil displacement agent is improved. The raw materials of the oil displacement agent are cheap an