A single pulse picosecond Nd:YAG frequency-doubled laser is made up of a resonator, single pulse-selector, amplifier, double frequency crystal, light beam expander and collimator and so on. In order to generate a series of mode-locked pulse laser lights, a passive mode-locked dye cell is used in the resonator. A single pulse laser light is obtained from the series of mode-locked pulse laser lights after they have passed the single pulse-selector. Finally, output of a laser light beam with energy of 120 mJ and wavelength of 532 nm is realized after the single pulse laser light is amplified and doublea in frequency. Because a laser light drift controller, which is researched and developed by ourselves, is usea in the resonator of the laser, a out-triggering synchro-precision of better than 2 μs is obtained from the laser.