The invention provides an automatic decontamination device for optical lenses, belonging to the field of optical lens processing equipment. The automatic decontamination device comprises a box body which is internally provided with a plurality of lens plates; the lens plates are connected with the inner wall of the box body in a sliding way; lens grooves are respectively formed in the upper sides of the lens plates; the lens grooves are in necking down shapes from top to bottom, and the center of the bottom of each lens groove is provided with a bottom hole passing through the two sides of the corresponding lens plate; each lens groove is provided with a water through hole; each lens plate is also provided with a blow-down hole; the bottom of the box body under the lens plates is provided with a drain outlet; two spray head used for washing are respectively arranged on the inner walls of the two sides of the box body at the upper side and the lower side of each lens plate; the spraying directions of the spray heads are respectively towards the upper sides and the lower sides of the corresponding lens plates; the decontamination device also comprises liquid storage barrels; the spray heads arranged on the inner wall of one side of the box body are respectively communicated with one liquid storage barrel, and the spray heads are communicated with the liquid storage barrels respectively by a connecting pipe; each connecting pipe is provided with a high-pressure water pump. The automatic decontamination device is high in cleaning force, comprehensive in cleaning and good in cleaning effect.