The invention discloses a cast iron processing cutting fluid which is composed of the following components in parts by mass: 15-20 parts of ethanediol monostearate, 5-8 parts of triethanolamine, 3-5 parts of ginger juice, 8-12 parts of ethanediol, 6-10 parts of octadecyldihydroxyethyl betaine, 3-5 parts of polysorbate, 6-10 parts of alkylphenol polyoxyethylene, 3-5 parts of antiwear additive, 5-8 parts of rust inhibitor, 1-2 parts of defoaming agent and 0.2-0.5 part of colorant. The cast iron processing cutting fluid is compounded by selecting favorable materials and adopting a scientific processing method under the conditions of high temperature and high pressure. The cast iron processing cutting fluid has the advantages of favorable fusion effect, no stratification, high antimicrobial capacity, favorable antirust effect and fewer precipitates in the use process, thereby ensuring the product to be clean and acceptable. The nitrites and phosphorus and sulfur compounds are eliminated in the product formula, and the ginger juice is added, so that the cast iron processing cutting fluid is green and environment-friendly, reduces the damage and harm of the chemicals to the environment and human body, is nontoxic, can obviously enhance the smoothness of the processed surface, can provide favorable antirust protection for parts, and is suitable for machining of ferrous metals, aluminum and aluminum alloys.