A laser diode pumped 1.3 μm high energy picosecond regenerative amplifier is reported. The passively mode-locked oscillator as a seed source provides repetition rate of 65 MHz and power of 140 mW. An effective regenerative amplifier is designed. The regenerative amplifier is operated at 1 kHz and its pulse duration is shorter than 20 ps. Its output pulse energy is 1 mJ. Its pulse stability root mean square is less than 0.3%. The beam quality factor M2 is less than or equal to 1.1 after second harmonic generation to 671 nm, which shows its good beam profile.