Power transmission case and transmission system for agricultural vehicle and multifunctional corn harvester

The utility model discloses a transmission case, a transmission system and a multifunctional corn harvester for an agricultural vehicle, the transmission case comprises a transmission case body, a driving shaft and a driven shaft are arranged on the transmission case body, a first gear is arranged on the part of the driving shaft in the transmission case body, and a second gear is arranged on the driven shaft. A transmission case power input wheel and a transmission case first power output wheel are arranged on the part, outside the transmission case body, of the driving shaft; a second gear matched with the first gear is arranged on the portion, located in the transmission box body, of the driven shaft, and a transmission box second power output wheel is arranged on the portion, located outside the transmission box body, of the driven shaft. A first engine power output wheel of an engine of the transmission system transmits power to a transmission box power input wheel, and a second engine power output wheel