Large laser copying machine easy to cool and dissipate heat

The invention discloses a large laser copying machine easy to cool and dissipate heat. A fixation assembly is arranged in a machine shell, a radiator is arranged below the fixation assembly, a fan isarranged below the radiator, and heat dissipation holes are formed in the machine shell below the fan. The fixation assembly comprises a shell, a heating roller and a pressure roller are arranged in the shell, a temperature sensor is arranged on the inner wall of the shell above the heating roller and is connected with the signal input end of a controller through a signal processing module, and athermal protection switch is also arranged on the inner wall of the shell above the heating roller. Through two cooling structures of air cooling and water cooling for the fixation assembly, the heatgenerated by the long-time work of the large-scale laser copying machine can be effectively reduced; in addition, the circuit structure of the thermal protection switch protects the heating roller from working at a limit temper