The embodiment of the invention provides a laser, a synchronous machine thereof, a trigger method and device of a seed source and electronic equipment. The laser comprises the seed source, at least one primary laser amplifier and at least one primary amplifier trigger device, wherein the seed source is used for emitting seed light, the at least one primary laser amplifier is used for amplifying the seed light, the at least one primary amplifier trigger device is used for periodically sending a trigger signal to the corresponding laser amplifier, the sending efficiency is a times per second, and a is an integer larger than or equal to 2. The seed source trigger device is used for acquiring a target frequency, the target frequency is (a-n) times per second, and n is an integer larger than or equal to 0 but less than a. The moments when (a-n) times of trigger signals are sent to the seed source is determined according to a preset algorithm, so that the moments are in one-to-one correspondence to the moments when (a-n) times of trigger signals are sent by the amplifier trigger device per second; and the trigger signals are periodically sent to the seed source according to the moments. With the laser and the seed source trigger device, provided by the embodiment of the invention, the problem that a light path is needed to be debugged again and light intensity distribution is changed under different working frequencies can be prevented.