The utility model discloses a wind cap component for a fluidized bed boiler. The wind cap component comprises a longitudinally extending air duct (2) and a longitudinally extending bell jar (3), wherein the first end (21) of the air duct is open-ended, and the second end of the air duct is closed through an end wall (22); a protruded shoulder (24) is arranged on the side wall of the air duct; wind gaps (23) are formed in the area between the convex shoulder and the second end of the air duct; the first end of the bell jar is open-ended, and the second end of the bell jar is closed through an end wall (32); a wind gap (33) is formed in the side wall of the bell jar; a mounting hole (31) penetrating through the end wall is formed in the end wall of the bell jar; an outwards protruded limiting pillar (25) is arranged on the end wall of the air duct; the bell jar covers the air duct, so that the limiting pillar penetrates through the mounting hole, and the first end of the bell jar falls on the protruded shoulder; the limiting pillar is fixedly connected with the mounting hole. The wind cap component is convenient to mount and dismount.