Abstract: Pasteurizer for food products comprising a tank provided with agitator means connected to actuating means, characterized in that said tank has on the bottom a chamber cavity in which said agitator means are accommodated, said chamber being provided on the bottom with a hole which faces, towards the inside of the chamber, the internal cavity of a cylindrical sleeve projecting inside the chamber and fixed thereto, and, towards the outside, the actuating means, said agitator means being provided with a movement transmission shaft which, inserted in the cavity of the sleeve and through the hole on the bottom of the chamber, is coupled to the actuating means, said internal cavity of the sleeve being provided with fluid sealing means.