The invention discloses a processing process method of cigarette with low heavy metal content Cu. The main working procedures comprise the following specific technological parameters: 1) the working procedure of microwave loosing: microwave power is 121 kW, and processing time is 240s; 2) the working procedure of loosing and regaining moisture: water vapour nozzle steam pressure is 0.3 MPa, hot wind temperature is 70 DEG C, barrel revolving speed is 13r/min; 3) the working procedures of HT and drying cut tobacco: HT working steam pressure is 0.1 MPa, hot wind temperature is 86 DEG C, humidity discharging air door aperture is 33%, hot wind air door aperture is 31%, the barrel revolving speed is 13r/min, wherein the HT is the working procedure of cut tobacco warming and humidifying by utilizing a tunnel cut tobacco warming and humidifying machine. The invention effectively lowers the content of the low heavy metal content Cu in the smoke of a prepared cigarette product by the optimal combination of the technological parameters of the existing working procedures.