Cooling device for gas turbine blade

The invention provides a cooling device for a gas turbine blade. The cooling device comprises two plate-shaped pieces arranged in the blade in a spaced mode, and a cooling flow channel extending from the front edge of the blade to the tail edge of the blade is formed between the two plate-shaped pieces; a plurality of fins are arranged between the two plate-shaped pieces, the fins are arranged at intervals and are constructed to extend in the extending direction of the cooling flow channel, and a sub-flow channel is formed between every two adjacent fins, so that cooling air passing through the sub-flow channels exchanges heat with the plate-shaped pieces and the fins; a rib column array composed of a plurality of rib columns is arranged in at least one part of the sub-flow channels so as to disturb cooling air passing through the sub-flow channels, and therefore the turbulivity of the cooling air in the cooling flow channels is improved. 本公开提供一种燃气透平叶片用冷却装置，包括间隔设置于叶片内的两个板状件，两个板状件之间形成由叶片的前缘向尾缘延伸的冷却流道；两个板状件之间设置