The preparation method of the viscosity reducer comprises the following steps: esterifying rosin acid and polyethylene glycol to prepare the rosin apolyethylene glycol monoester reacting excel rosin apolyethylene glycol monoester with chlorosulfonic acid to prepare rosin polyethylene glycol sulfate and neutralizing the rosin polyethylene glycol sulfate and an alkali to form the salt. The viscosity reducer is a mixture composed of rosin apolyethylene glycol monoester and a sodium salt of rosin polyethylene glycol sulfate according to a molar ratio of (0.5-1.5):1.
The invention relates to an oil-in-water type crude oil emulsification viscosity reducer and a preparation method thereof.
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