The invention provides a cutting processing cooling device, comprising a low-temperature liquid storage tank 9, a gas mixing room 8, a compressed air filter 3, a pipe joint, a liquid nitrogen conveying pipe, electromagnetic valves 1, 2, 4, a pressure sensor 6, a temperature sensor 7, a control module, a detection module, a computer (industrial computer, micro-computer or singlechip), a display, a keyboard, and a signal line. The low-temperature liquid storage tank 9 is connected with the gas mixing room 8 through a gas conveying pipe and the electromagnetic valve 4; the compressed air is connected with the gas mixing room 8 through the gas conveying pipe, the filter 3 and the electromagnetic valve 2; the low-temperature gas and the normal-temperature gas are mixed in the mixing room; the output of the gas mixing room 8 passes through the gas conveying pipe and the electromagnetic valve 1; the temperature sensor 7 and the pressure sensor 6 in the gas mixing room 8 are connected with the detection module through the signal line; the electromagnetic valve 1, the electromagnetic valve 2 and the electromagnetic valve 4 are connected with the control module through the control signal line; the control module and the detection module are connected with the computer through communication lines.