The invention belongs to the field of wing designing of planes and relates to a front edge slat cavity reshaping mechanism capable of reducing drag and noises. The front edge slat cavity reshaping mechanism comprises a lower reshaping plate, an upper reshaping plate, a movable hinge, an actuator, a fixed rotating shaft and a sliding groove. The extending length of the lower reshaping plate is the same as the length of a front edge slat, one end of the lower reshaping plate is connected with the actuator through the movable hinge, and the other end of the lower reshaping plate is connected with a rear end point of a lower wing of the slat through the fixed rotating shaft. The front edge slat cavity reshaping mechanism can reduce pneumatic noises in taking off, entering and landing, improves comfort and environment protection property of civil aircrafts, and can serve as a measure for ensuring the aircrafts to pass the China civil aviation regulations (CCAR36) airworthiness specifications. Simultaneously, due to the fact that strong vortex disappears, the pneumatic resistance is reduced, lift-drag ratio during taking off of the aircrafts can be improved, and safety and economy during taking off of the aircrafts can be facilitated.