The invention discloses a multi-motor power generation device and a wind power generation unit. The multi-motor power generation device comprises a transfer case, a first motor and a second motor. The transfer case comprises an input shaft, a first output shaft and a second output shaft. The first output shaft is connected with the first motor. The second output shaft is connected with the second motor. Only the first motor is connected with a converter device. The converter device connected with the first motor can adjust the electric power of the second motor. According to the multi-motor power generation device and the wind power generation unit, speed change operation control over the wind power generation unit with larger power is achieved through the converter device with smaller power, the system cost is lowered effectively, and the multi-motor power generation device and the wind power generation unit have the advantages of being low in manufacturing difficulty, good in reliability and the like.