The utility model provides an engine sealant applying device, belongs to the technical field of automobile engine manufacture, and solves the problem of poor applying quality due to the fact that a conventional engine applying manner is hand applying and is relatively backward. The engine sealant applying device comprises an upper applying plate, a lower applying plate and a filter net, wherein the lower applying plate can be butted against the sealing surface of a coated workpiece, through applying slots are formed in the upper applying plate and the lower applying plate, tracks of the applying slots are identical to those of sealant on the coated workpiece, the upper applying plate, the filter net and the lower applying plate are sequentially stacked and fixedly connected, and locating holes corresponding to the coated workpiece are formed in the upper applying plate and the lower applying plate. The applying slots whose tracks are identical to those of the sealant in the coated workpiece are formed in the upper applying plate and the lower applying plate, thickness and fineness of the sealant are guaranteed, the applying boundary of the applying slots is guaranteed, and the product quality is improved.