Multi-beam laser time synchronization test method

The invention provides a multi-beam laser time synchronization test method. The method is characterized in that two phototubes are placed at a target point and a reference point of a reference light path respectively in a test, the reference light path emits a laser pulse at first, and an oscilloscope measures a time interval deltat1 between the time when the pulse of the reference light path reaches the target point and the time when the pulse of the reference light path reaches the reference point; then a light barrier is placed in the reference light path so as to enable the pulse of the reference light path not to reach the target point, the reference light path and a light path to be tested emit laser pulses simultaneously, the oscilloscope measures a time interval deltat2 between the time when the pulse of the light path to be tested reaches the target point and the time when the pulse of the light path to be tested reaches the reference point; and a difference value between the time interval deltat2 and the time interval deltat1 is a synchronization time difference value of the pulse of the light path to be tested and the pulse of the reference light path for reaching the same target point. The light path to be tested is replaced, and a time synchronization difference value of a pulse of the corresponding light path to be tested relative to a pulse of the reference light path for reaching the target point is provided. The multi-beam laser time synchronization test method is simple in operation process, less in involved equipment, and capable of realizing a direct test for the multi-beam laser pulse target point reaching time synchronization without moving or increasing measuring equipment.