In order to study the effect of wire feed speed and welding speed on the forming of Q345E low-alloy steel narrow gap laser wire-bonding welding,the experiment were designed by changing the wire feeding speed and welding speed. According to the test results,the macro-metallurgical status of the welded joint at the welding speed and wire feed speed,the penetration depth and the weld width were analyzed. Through the analysis and comparison,the suitable wire feeding speed of Q345E narrow-gap laser wire-bonding backing welding were obtained,the welding speed was 5 m/min and the welding speed was 0.36 m/min.