The pivot type gear box is belongs to the field of gear transmission in mechanical engineering. The present invention includes box containing input shaft, box containing output shaft and toothed shaft coupler. The box containing input shaft includes input shaft, the first chuck, input shaft bearing, the first bearing seat, the first steel casing, the first bevel gear, the second bevel grea, the first shaft, the second shaft, the first bearing, clamp spring, the first gear box casing, the second bearing and the second bearing seat. The present invention has simple structure, standard parts, easy manufacture, and low production cost.