The invention aims to provide a kitchen oil stain cleaning agent and a preparation method thereof. The kitchen oil stain cleaning agent has excellent oil stain removing capacity; meanwhile, a formulaof the kitchen oil stain cleaning agent adopts low-toxicity and low-irritation matters, so that the harm to a human body is reduced; a conventional solvent of a traditional oil stain cleaning agent isnot adopted, but isopulegol and p-1,8-diol are selected as mixed solvents, the isopulegol is commonly used as flavoring essence and is mainly used for preparing mint and berry essence, the p-1,8-diolis commonly used as a component of a mosquito repellent in the prior art, and the isopulegol and the p-1,8-diol are low in biotoxicity and is safe in use. According to the kitchen oil stain cleaningagent provided by the invention, organic alkali monoethanolamine is used for replacing traditional inorganic alkali, the buffer capacity is strong, the alkalinity is reduced, the corrosivity is lower,and irritation and damage of a cleaning agent to skin are reduced while excellent oil stain removing capacity is obtained.