Plate-type fuel assembly and reactor core

The invention discloses a plate-type fuel assembly and a reactor core. The plate-type fuel assembly comprises a metal cylinder and a plurality of groups of fuel structures arranged in the metal cylinder, the multiple sets of fuel structures are sequentially stacked in the metal barrel and extend in the length direction of the metal barrel. Each fuel structure comprises a fuel layer and a cooling layer stacked on at least one side of the fuel layer. The cooling layer is provided with a plurality of coolant channels arranged at intervals, and the coolant channels penetrate through the two opposite end faces of the cooling layer and are communicated with the two open ends of the metal barrel respectively. The plate-type fuel assembly is used for forming a reactor core, is formed by stacking the fuel layer and the cooling layer in the metal cylinder, is high in structural strength, and is provided with a plurality of coolant channels in the cooling layer, so that the heat transfer area is increased, the ratio of