The invention relates to a czochralski method growth process of sodium nitrate monocrystalline. The czochralski method growth process includes the following steps that sodium nitrate is put into a crucible after being dried at the temperature of 100 DEG C to 200 DEG C for 2 hours to 5 hours; the crucible with the sodium nitrate is placed in a lifting furnace, the temperature of the furnace rises to 350 DEG C to 450 DEG C 2 to 5 hours later and remains for 1 hour to 2 hours, the sodium nitrate in the crucible is completely melted, and heating power is lowered slowly; when the temperature of the furnace is controlled in the range of from 250 DEG C to 350 DEG C, seed crystals are soaked in the melt, the seed crystals are rotated and lifted and begin to grow, the lifting speed ranges from 1.0 mm/h to 10 mm/h, the rotating rate ranges from 10 r/min to 20 r/min, the temperature gradient of the solid-liquid interface ranges from 10 DEG C/cm to 30 DEG C/cm; according to the crystal growth tendency, the heating power is slightly adjusted, the shouldering and isometrical processes are finished, growth is completed, the crystals are lifted and taken out to be separated from the melt, and the furnace body is cooled to the room temperature at the cooling rate of 20 DEG C/h to 50 DEG C/h; the thermal stress of the crystals is small, and cracking of the crystals can be reduced.