Concrete demolding agent and preparation method thereof

The invention discloses a concrete demolding agent and a preparation method thereof and relates to the technical field of building materials. The concrete demolding agent includes, by weight, 20-50% of an oil substance, 1-5% of a thickener, 40-70% of deionized water, 0.1-0.5% of a preservative, 1-3% of a whitening agent, and 1-3% of an odor covering agent. The oil substance includes one or more ofengine oil, saponified oil and lubricant oil. The preparation method includes: S1) weighing the oil substance, thickener, deionized water, preservative, whitening agent and odor covering agent according to the weight percentages; S2) placing the deionized water and thickener in a stainless steel container and mixing and stirring the components for 10-20 min; S3) adding the oil substance, preservative, whitening agent and odor covering agent to the mixture, and mixing and stirring the components for 15-25 min; S4) performing filling package. The concrete demolding agent has good stability andis prepared from the engine oil and other additives in less quantity, so that the product is simple in component, is convenient to prepare and is low in cost.