To provide a grinding-cutting liquid easy to produce and excellent in cooling property and chip-removing property at low cost.

This grinding-cutting liquid is a cooling liquid for machining supplied to a part to be processed for cooling or removing chips at cutting or grinding processing of a metal material, which is water or an aqueous solution subjected to a reforming treatment so as to have reducing property in alkalinity to water by a method other than electrolysis. The water or aqueous solution subjected to a reforming treatment has a pH of 9.0 or more and an ORP of 0.0 mV or less, which is produced by subjecting water or an aqueous solution to a treatment of immersing in or contacting a treating material containing a mineral or a ceramic material possessing property of imparting reducing property in alkalinity to water or an aqueous solution by immersing therein or contacting it.

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