The invention discloses a structure used for crushing square-brick-shaped brown sugar. A working platform and a reinforced supporting plate are rivet-welded together. A bearing beam is welded to the lower side of the reinforced supporting plate and further welded between lower stand columns of two portal frames. Stand columns are arranged at the left side and the right side of a working platform face, and a transverse fixed plate is placed at the top ends of the stand columns to form a portal frame. An air cylinder is placed on an air cylinder fixing plate and is fastened with the transverse fixed plate through bolts. Punches are fixed to a push rod screw of the air cylinder and are further locked through adjusting screw nuts. Reinforcing ribs are welded to the inner included angle positions of the stand columns and the transverse fixed plate. Air cylinder work is controlled by a foot switch. The up-down positions of the punches can be adjusted through the adjusting screw nuts. The periphery of the working platform is sealed with plates, and one of the plates can be opened. According to the technical scheme, the structure used for crushing the square-brick-shaped brown sugar is simple in structure, easy and convenient to operate, and capable of replacing manual operation and reducing labor cost.