Header with self-adaptive grain lifting device

The invention discloses a header with a self-adaptive grain lifting device, and belongs to the technical field of agricultural machinery, the header comprises a central hanging frame used for being connected with a main machine, and the central hanging frame comprises a central hanging frame welding part, a turnover supporting leg and a chain plate frame sliding seat; the chain plate frames are symmetrically distributed on the two overturning supporting legs of the central hanging frame, and the chain plate frames are in sliding fit with the overturning supporting legs so that the two chain plate frames can slide close to each other or away from each other; the grain lifting device is arranged on the chain plate frame, and the grain lifting device comprises a grain lifter used for guiding crops and a sliding block device used for driving the grain lifter to be switched between a rising state and a falling state; the sliding block device is in linkage with the chain plate frames, so that when the two chain pla