A subglacial classified fishnet relates to lake fishing tool technical field in north at winter, while prior winter traditional fishing tool uses subglacial large draw net, which can only mixed pick fish, but can not separate large fish and small fish, and separate different fish species, therefore, prior art can not protect demanded fish pieces. The utility model is characterized in that one net layer is arranged based on large draw net, to be drawn by an upper block, a middle block and a lower block, while the buoyant force of the floater of the upper block is lower than the gravity sum of the sinkers on the middle and lower blocks, the sinker gravity of the middle block is lower than the buoyant force of the floater of the upper block, the height between the middle and lower blocks is 20-40cm, the heights of the middle and upper blocks can be adjusted according to the depth of lake. The utility model can separate and pick up different fish species according to different habits.