This paper puts forward an experimental program on accurate phase matching control between laser pulse and MIG arc waveform, and achieves continuous trigger control of the laser pulse. With the relationship between laser pulse, MIG arc and droplet, the effect of laser pulse on droplet transfer is studied by controlling laser pulse to act on the peak value and basic value of the MIG arc waveform respectively during laser-MIG hybrid welding process on aluminum alloy 6061. High-speed camera is used to acquire the droplet transfer. Experimental results show that the form of droplet transfer hasn’t changed with the laser pulse acting. However, laser pulse can changes the necking form of droplet and the speed for droplet transfer by changing the electromagnetic force. The necking form of droplet changes from symmetrical necking to asymmetrical necking when the laser pulse acts on the peak value, however there is no significant change for the necking form when the laser pulse acts on the basic value. The speed of droplet transfer is faster than that without laser, and it improves with the increase of the laser power. The speed of droplet transfer with laser acting on the basic value is faster than that with laser acting on the peak value. Welding appearance with laser pulse acting on the basic value is better than that with laser pulse acting on the peak value. It is thought that this study can technically support the aluminum alloy welding with high speed and low thermal damage at small welding currents.