Prefabricated limiting piece, spar cap, fan blade and manufacturing method, and prefabricated panel fixing method

The invention discloses a prefabricated limiting piece, a spar cap, a fan blade and a manufacturing method, and a prefabricated panel fixing method. The prefabricated limiting piece at least comprises an upper clamping groove and a lower clamping groove which are continuously arranged in the groove width direction, and the width of the upper clamping groove and the width of the lower clamping groove are both set to be multiple of the width of at least one prefabricated panel; and the height of the upper clamping groove and the height of the lower clamping groove are set to be the height of the prefabricated plate. According to the prefabricated limiting piece, the resin-rich defect that the strength is weakened due to the fact that a large gap is generated due to relative slippage between the adjacent plates is reduced or avoided, and meanwhile the resin-rich defect caused by the fact that the plates are not attached to the core material due to edge protrusion caused by plate dislocation is reduced. 本发明公开了一种预