The invention discloses a planet carrier capable of achieving gear shifting. The planet carrier comprises a gearbox output shaft, a bracket, a gearshift planet carrier body, an output gear ring, a gearshift duplex major planet gear, a gearshift duplex minor planet gear, a reverse output planet gear, a planet gear mounting pin, a reverse output duplex minor planet gear, speed-up planet sun gears, abase wallboard, a gear coupling shaft outer gear, a shifting center shaft, reverse output duplex major and minor planet gears, a clutch, and high and medium-gear sun gears; when an input shaft is moved, three sun gears with different numbers of teeth are engaged with the corresponding planet gears separately, and medium-speed and high-speed different output variable-speed sections and a reverselyoutput low-speed variable-speed section can be obtained; through the speed-up planet sun gears fixedly connected with the planet carrier, the speed-up planet sun gears and a constrained output disk of a constrained self-locking low tooth difference planet mechanism can be modified into the planet carrier; and the planet gears and the output gear ring are combined into a planet speed-up mechanism,and the speed regulation range can be increased exponentially.