Four-wavelength near&mid-infrared laser (1568.4, 1625.9, 3078.8、3231.1 nm) based on stoichiometric LiTaO3 superlattice (PPSLT) crystal is reported. The pump source is an optical fiber laser at 1064 nm wavelength. PPSLT has a dual-channels grating of 30 mm and 30.5 mm. When the pump power is 37 W, and repetition frequency is 50 kHz, the total output power reaches 14.9 W. The powers of the four wavelength lasers are 3.71, 4.36, 3.21 and 3.62 W, respectively. By adjusting the temperature of the PPSLT crystal, tunable output can be realized. Further optimization of optical parameter oscillator (OPO) resonant cavity will realize the equivalent output power of the four wavelength lasers.