The invention discloses a reuse system for cutting fluids of machine tools. The reuse system comprises a chip removal groove, a chip removal machine connected with the chip removal groove, a fluid collection tank connected with the chip removal machine, a filter device connected with the fluid collection tank through a fluid conveying main pipe, a fluid return main pipe connected with the filter device and fluid return branch pipes configured on the machine tools, wherein the chip removal groove is used for receiving chip-containing cutting fluids output by a plurality of machine tools; the fluid return main pipe is communicated with the fluid conveying main pipe through a fluid conveying branch pipe. The reuse system for the cutting fluids of the machine tools can effectively reuse the cutting fluids of the machine tools.