A hoisting mechanism for large heavy-load component in nuclear fusion environment, the hoisting mechanism comprising: a base frame, a pair of hanger arms, a top motor is provided at a front position in the base frame, wherein an output shaft of the top motor is connected with a first gear, wherein the pair of hanger arms are respectively arranged on left and right sides of the base frame and opposite to each other; at the front position in the base frame and on an upper portion of each of the hanger arms, first racks are respectively provided on front and rear sides of the first gear and opposite to each other; the first gear is engageable with the two opposing first racks at the same time; and a lower portion of each of the pair of hanger arms extends downward beyond a bottom of the base frame, characterized in that the hoisting mechanism further comprises a pair of arc arms, and rotary motors are provided at a rear position in the base frame, wherein the pair of arc arms are respectively arranged on the left and right sides of the base frame; an outer arc surface of each of the arc arms faces upward, one end thereof extends forward and upward, and the other end thereof extends rearward and downward beyond the bottom of the base frame; each of the arc arms is respectively provided with an arc-shaped groove corresponding to a shape of the arc arm and penetrating through the arc arm in a left-right direction; a second rack corresponding to the shape of the arc arm is respectively provided on the outer arc surface of each of the arc arms; and a plurality of support points are respectively provided on the left and right sides of the base frame which are arranged in an arc shape matching the arc arm, and each of the arc arms is slidably fitted to the respective support points on the corresponding side through the respective arc-shaped groove, and wherein second gears are respectively mounted on the left and right sides of the base frame at positions corresponding to the rotary motors, the second gear is respectively drive-engaged with the second rack of the arc arm on the corresponding side, and an output shaft of the rotary motor is drive-connected with the second gear. a base frame, a pair of hanger arms, a top motor is provided at a front position in the base frame, wherein an output shaft of the top motor is connected with a first gear, wherein the pair of hanger arms are respectively arranged on left and right sides of the base frame and opposite to each other; at the front position in the base frame and on an upper portion of each of the hanger arms, first racks are respectively provided on front and rear sides of the first gear and opposite to each other; the first gear is engageable with the two opposing first racks at the same time; and a lower portion of each of the pair of hanger arms extends downward beyond a bottom of the base frame, characterized in that the hoisting mechanism further comprises a pair of arc arms, and rotary motors are provided at a rear position in the base frame, wherein the pair of arc arms are respectively arranged on the left and right sides of the base frame; an outer arc surface of each of the arc arms faces upward, one end thereof extends forward and upward, and the other end thereof extends rearward and downward beyond the bottom of the base frame; each of the arc arms is respectively provided with an arc-shaped groove corresponding to a shape of the arc arm and penetrating through the arc arm in a left-right direction; a second rack corresponding to the shape of the arc arm is respectively provided on the outer arc surface of each of the arc arms; and a plurality of support points are respectively provided on the left and right sides of the base frame which are arranged in an arc shape matching the arc arm, and each of the arc arms is slidably fitted to the respective support points on the corresponding side through the respective arc-shaped groove, and wherein second gears are respectively mounted on the left and right sides of the base frame at positions corresponding to the rotary motors, the second gear is respectively drive-engaged with the second rack of the arc arm on the corresponding side, and an output shaft of the rotary motor is drive-connected with the second gear.