The invention provides an anti-foreign matter plate of a light water reactor nuclear fuel component. The anti-foreign matter plate comprises an edge part, a plurality of pipe orifice units and a plurality of filtering hole units, wherein the plurality of the pipe orifice units are arranged on the inner side of the edge part like an independent array, and the plurality of the filtering hole units are flatly laid and arranged between the edge part and the plurality of the pipe orifice units. The invention further provides a bottom device of the light water reactor nuclear fuel component. The bottom device comprises the anti-foreign matter plate. Compared with the prior art, as the pipe orifice units of the anti-foreign matter plate disclosed by the invention are arranged like the independent array and the filtering hole units are flatly laid and arranged, the number of the filtering hole units on the anti-foreign matter plate can be maximized under the same situations, the circulation area of cooling water can be further increased, the resistance of the cooling water when the cooling water passes through the anti-foreign matter plate, and the loss of pressure drop can be also reduced.