This work describes a plasma neutralizer for ion beams and investigation results of conversion of Hions into neutral atoms on the plasma target. The working medium of neutralizer is thermal plasma (potassium, cesium). The design of neutralizer allows to receive an integrated density of a plasma target ~ 10 15 1/cm 2 a degree of ionization of plasma may be adjusted. Dimensions of the neutralizer-diameter of 240 mm., length-350 mm. Power consumption-10 kW. In this work coefficient of conversion of Нions into neutral atoms and angular scattering of neutral atoms on a plasma target depending on ions energy, thickness of a target and degree of plasma ionization were measured.