Clamping oil circuit system of coarse cutter

The utility model discloses a clamping oil circuit system of a coarse cutter, which comprises a dividing oil circuit and a clamping oil circuit which are communicated with a hydraulic oil circuit of the coarse cutter; the clamping oil circuit is provided with a manual clamping valve and a clamping oil cylinder controlled by the manual clamping valve; and the clamping oil circuit system of the coarse cutter is characterized in that the manual clamping valve on the clamping oil circuit is communicated with the hydraulic oil circuit by a one-way valve. The clamping oil circuit system of the coarse cutter has the advantages that the one-way valve is added on the clamping oil circuit; when the pressure of the system is reduced or error operation occurs, the one-way valve reversely blocks, so as to automatically close the clamping oil circuit, thereby keeping the pressure in the clamping oil circuit, preventing work pieces from having error operation in processing and the normal work from being affected, and improv