The invention discloses a photovoltaic welding strip production system with high optical utilization ratio and a method of the photovoltaic welding strip production system. The photovoltaic welding strip production system comprises a drawbenching machine, wherein the drawbenching machine is used for drawbenching a copper wire raw material, a wire outlet end of the drawbenching machine is connectedwith a wire inlet end of a calender, a wire outlet end of the calendar is connected with a feeding hole of an annealing furnace, a discharging hole of the annealing furnace is connected with a material inlet end of a cleaning machine, a tin plating machine is arranged at a right side of the cleaning machine, a winding machine is arranged at a discharging hole of the tin plating machine, and the drawbenching machine, the calender, the annealing furnace, the cleaning machine, the tin plating machine and the winding machine are sequentially connected by a conveying belt. By the photovoltaic welding strip production system, the problem that the copper strip can be bent caused by tin plating on the copper strip by a traditional tin plating machine in the prior art is solved. The photovoltaic welding strip production system has the advantages of novel and reasonable design, high working reliability, long service lifetime and the like, and the quality and the performance of a product are improved.