The invention discloses a slicing assembly type residual mulch clearing drum which is characterized in that a drum shaft is fixedly mounted on a support saddle; a drum is mounted on the drum shaft through a bearing; through holes are uniformly distributed in the drum wall; cam plates with annular grooves are fixedly mounted on the drum shaft; the cylindrical drum adopts such a structure that ribs are uniformly distributed on and fixedly connected to end plates at the two ends of the drum; the slicing assembled drum wall is connected to the ribs; mulch picking tooth beams parallel to the drum shaft are uniformly arranged around the periphery of the cam plates; swinging arms are hinged on the mulch picking tooth beams; rollers arranged at one end of the swinging arms are matched with the annular grooves of the cam plates; connecting rods are hinged on the mulch picking tooth beams; one end of each connecting rod is hinged on a rib hinged seat; mulch picking teeth protruding outwards are fixedly connected to the mulch picking tooth beams; the uniformly distributed mulch picking teeth are matched with the through holes uniformly distributed in the drum wall; and a chain wheel fixedly connected to the end plate at one end of the drum is matched with the drum shaft through a bearing. The slicing assembly type residual mulch clearing drum has the advantages of reasonable structure, convenience in operation, low failure rate in operation, high residual mulch recovery rate, solidness, durability, and convenience in disassembly and maintenance.