Novel torque multiplication wrench

A novel torque multiplication wrench comprises a fixed gear with inner gear rings arranged therein. Three sets of center gears and three sets of planet gears are arranged in the fixed gear. The three sets of center gears comprise the first center gear, the second center gear and the third center gear. The three sets of planet gears comprise the first planet gear, the second planet gear and the third planet gear. The first planet gear is meshed with the first center gear and the corresponding inner gear ring. The second planet gear is meshed with the second center gear and the corresponding inner gear ring. The third planet gear is meshed with the third center gear and the corresponding inner gear ring. The first planet gear is connected with the second center gear through a first planet carrier. The second planet gear is connected with the third center gear through a second planet carrier. The third planet gear outputs power through a third planet carrier. The first center gear is connected with a power input shaft, and the power input shaft is connected with a crank. The structure is compact, use is easy and convenient, labor is saved during use, and output torque is more accurate and reliable.