In order to improve the processing precision and quality of a connecting-rod splitting notch and to improve its manufacturing yield, two kinds of connecting-rod products were manufactured and laser processing parameters were also determined. The splitting notch processing on two kinds of connecting rods was carried out by a Nd∶YAG solid laser and then the influence of different cutting parameters on the cutting quality was analyzed and the laser cutting parameters were optimized. The result shows that the laser peak power, clearance between focus and plate, cutting speed, impulse frequency, assistant air pressure, and the angle of laser incidence have a great influence on the processing quality of splitting notch. When the peak power of laser is 2.4 kW and the impulse time is 0.4 ms, the depth of cutting notch is 0.453-0.457 mm. Moreover, when the ratio between impulse frequency and cutting speed is 3, the splitting notch processed is conductive to the splitting of connecting rod in the condition of the minus clearance between focus and plate, which can meet the demand of the splitting quality of M0406 connecting-rods.