The invention relates to a multifunctional corn harvester which comprises a vehicle, a longitudinal lift conveyer and a cutting platform. The longitudinal lift conveyer is installed on the vehicle with the cutting platform in front. The cutting platform is composed of an upper layer & a lower layer within a reel assembly device and a transverse corn conveying device as well on the upper. On the other hand, the lower layer cutting platform adopts a stalk collecting and conveying device, which comprises a root and stem cutter, a stalk conveying device, an auger and a stalk conveyor. This type ear corn harvester can realize not only the corn ear cutting but also diversified demands of stalk treatment. The compacted configuration adopts double-layer cutting platform combined with a corn ear picking function on the upper layer and stalk cutting & conveying functions on the lower layer. The alternative function is provided for stalk crushing device for cleaning & crushing. The machine utilizing a cutter type crusher can realize ensilage cutting function. When the plate at the bottom of the stalk conveying device is opened, the stalk laying function is plus as requested. Both ear and stem can be harvested accordingly by the machine with less grain discharging and diversified treatment of stalk simultaneously.