The invention relates to the technical field of speed-changing boxes and particularly relates to a novel shifting speed-changing box. The novel shifting speed-changing box comprises a main motor, wherein the main motor is arranged at the outer side of a box body and is connected with a first gear shaft in the box body; the first gear shaft is meshed with a large gear of a second rotating shaft; the large gear of the second rotating shaft is arranged on the outer side surface of a second shifting shaft; a tail end of the second shifting shaft penetrates out of the box body and is connected with a cylinder, so that the second shifting shaft can move up and down along the axial direction; the large gear of the second rotating shaft can be movably matched with a gear surface on the outer side surface of a third gear shaft; the second shifting shaft is also provided with a small gear of the second rotating shaft, which can be movably matched with a large gear of a third rotating shaft; the large gear of the third rotating shaft is arranged on the outer side surface of the third gear shaft; and a tail end of the third gear shaft extends out of the box body and is connected with an outside transmission mechanism. The novel shifting speed-changing box has the advantages that parts needed are fewer, so that the complexity degree of the structure is greatly reduced, the structure is more compact, the reliability is high and the production cost is lower.