The invention provides an internal packaging structure, a packaging box and electrical equipment, and relates to the technical field of packaging. The technical problem that fittings are prone to being damaged and deformed due to scattered placement is solved. The internal packaging structure comprises an internal packaging piece used for protecting to-be-packaged equipment, and the internal packaging piece is provided with one or more piece accommodating parts capable of accommodating the fittings required by the to-be-packaged equipment; by arranging the multiple piece accommodating parts capable of accommodating the fittings on the internal packaging piece, the fittings are placed reasonably and neatly under the condition without increasing the volume of the internal packaging piece while the internal packaging piece protects the to-be-packaged equipment, and thus damage or deformation of the fittings in the transportation process is avoided; and due to the fact that a separate fitting box does not to be arranged, the space above the internal packaging piece is fully utilized, the size of the packaging piece can be further decreased, the space is saved, and the packaging cost ofthe equipment is lowered. The packaging box comprises an external packaging structure and an internal packaging structure placed in the external packaging structure; and the electrical equipment is packaged in the packaging box.