Brassica campestris harvester

The utility model discloses a brassica campestris harvester which comprises a header, a walking system and an electric drive system, the header is installed at the front end of the walking system, and the electric drive system is distributed on the walking system. The header comprises a collecting box, a reciprocating cutter, a cutter frame, a hanger plate, a pair of slide rails and a pair of connecting plates; the cutting knife frame is fixedly installed on the upper surface of the collecting box, a through hole allowing cut brassica campestris to enter the collecting box is reserved in the middle of the cutting knife frame, and the reciprocating cutting knife is installed at the front end of the cutting knife frame. The pair of connecting plates is symmetrically installed on a machine frame of the walking system, each connecting plate is provided with a sliding rail, the bottoms of the pair of sliding rails are connected with the back face of the hanging plate, and the front face of the hanging plate is fix