The utility model discloses a mineral wool collecting device capable of effectively solving problems that wool collecting effects of wool collectors are reduced, falling wool increases and the felt forming amount is decreased due to the fact that meshes in wool collecting mesh belts are blocked by residual mineral wool easily during long-term operation of the wool collectors. The mineral wool collecting device comprises a wool collector, wherein the wool collector comprises a case and a wool collecting mesh belt device, a wool collecting chamber, an air-drying chamber and a clearing chamber are sequentially arranged in the case, the wool collecting mesh belt device comprises four chain wheels and a wool collecting mesh belt surrounding the four chain wheels, and the wool collecting mesh belt sequentially consists of a wool collecting section, an upper transition section, a wool falling section and a lower clearing section; the lower clearing section penetrates through the air-drying chamber, one end of the lower clearing section is located in the wool collecting chamber, and the other end of the lower clearing section is located in the clearing chamber; multiple cleaning nozzles which are arranged side by side are arranged in the clearing chamber and located above the lower clearing section; a plurality of upper blow-drying air outlets are arranged in the air-drying chamber and located above the lower clearing section, and a plurality of lower blow-drying air outlets are located below the lower clearing section.