The invention provides a production device of sodium nitrite, comprising an alkali-dissolving pool, an alkali absorption tower, a crystallizer, a thickener, a centrifuge, a mother liquor tank, a conversion tower, and a heat exchange mechanism; the heat exchange mechanism includes a condenser, Ejector, circulating water tank, circulating pump and cooling tower, the outlet of the flash chamber of the crystallizer is communicated with the first inlet of described circulating water tank through condenser and injector, and the outlet of circulating water tank is connected with described circulating pump The top of the cooling tower is connected, and the outlet of the cooling tower is connected with the second inlet of the circulating water tank, and the outlet of the circulating water tank is connected with the inlet of the lye absorption tower through an alkali-dissolving pool; the present invention adopts a heat exchange mechanism, The circulating water tank pumps the vacuum circulating water into the upper part of the cooling tower through the circulating pump, and uses the fan to pump the air, so that the air directly contacts the water to dissipate heat. efficiency and quality, and make up for the disadvantages of the original heat exchanger.