The invention relates to a long knife and short knife combined elastic type seed zone cleaning device. The long knife and short knife combined elastic type seed zone cleaning device comprises a power transmission device, a knife shaft device and a stubble cleaning and carding device, wherein the power transmission device comprises a shaft cup cover (1), a shaft cup (2) and a shaft head (3), a gear positioning sleeve (4) and a deep groove ball bearing (5), wherein the knife shaft device comprises a knife shaft pipe (6); the stubble cleaning and carding device comprises a cutterhead (14), a short bolt (7), a first thin nut (12), a long bolt (13), a second thin nut (8), a spring (9), a stubble cleaning knife (10) and a straw carding device (11). The device provided by the invention is mounted in front of furrow openers; long straws can be cleaned into a space between two lines of furrow openers while the stubble cleaning knife is used for cleaning straw stubbles; the straw carding device does not enter soil so that the resistance is reduced; the device is used for cleaning the straws while being used for directly cleaning the stubbles, so that power consumption is reduced and no-tillage seeding under large coverage of the straws can be realized; conditions that seeds are aired and are not uniformly sowed do not occur; the device is applicable to a corn no-tillage seeding machine and further popularization of protective tillage is easy to promote.