Multi-gear hybrid drive system and drive control method

The invention discloses a multi-gear hybrid drive system and a drive control method. The multi-gear hybrid drive system comprises an engine, a first motor, a second motor, a planet row mechanism, a speed change mechanism, an intermediate shaft and a gear shifting mechanism. The engine is connected with the first motor through a planet row mechanism. The planet row mechanism is further provided with a first output shaft, the intermediate shaft is provided with a first gear, a second gear and a third gear which are different in diameter, the first gear is meshed with a transmission shaft of the second motor, the first gear is in meshed transmission with the first output shaft, and the third gear is in meshed transmission with a second output shaft; the first output shaft and the second output shaft correspond to different gears, and the gear shifting driver can control the synchronizing device to be meshed with the first output shaft or the second output shaft. Two gears of multiple working conditions such as p