The invention relates to the technical field of wastewater treatment, and in particular relates to a concentration recovery system and method for active ingredients of a machining cleaning solution. Settling, coarse filtration, multi-times fine filtration, ultra-filtration and nano-filtration technologies are combined by adopting a system consisting of a waste liquid inlet, a settling tank, a settlement discharge opening, an infusion pump, a supernate tank, a booster pump a, a coarse filter, a primary fine filter, a secondary fine filter, a filtrate tank, a booster pump b, an ultra-filtration system, an ultra-filtrate discharge opening, an ultra-filtration water storage tank, a booster pump c, a nano-filtration system, a nano-filtration effluent storage tank and a nano-filtration concentrate recovery opening; and the active ingredients of the machining cleaning solution are recycled through the steps of settling, coarse filtration, multi-times fine filtration, ultra-filtration and nano-filtration, so that the recycle cost of the machining cleaning solution is reduced, the recycle rate of the machining cleaning solution is improved, the quality of the recycled machining cleaning solution is improved, and the system and the method have significant economic benefit and environment-friendly value.