The invention discloses a heavy metal contaminated soil remediation device which comprises a storage barrel, a conveyor belt, a treatment seat, a connecting plate and a bucket, wherein two pairs of first traveling wheels are symmetrically arranged on two sides of the bottom end of an outer side wall of the treatment seat; and the connecting plate is welded on one side of the bottom end of the outer side wall of the treatment seat. A pulley matched with a guide seat is arranged on a connecting rod at one end of the screening bucket, and a movable sleeve is arranged on the outer side of a guiderod in a sleeving manner on the outer side wall of the screening bucket. On one hand, by utilizing guide of a bevel end of the guide seat, the screening bucket is matched with a reset spring at the other end of the screening bucket in a process of driving the screening bucket to rotate by a motor, so that the screening bucket can sway from side to side in the rotating and screening process, and the screening efficiency and the screening effect are improved; on the other hand, a second magnetic block having the same magnetism as a first magnetic block is arranged on the top of the movable sleeve, so that the movable sleeve enabling the screening bucket to rotate to a position just under the first magnetic block has a vibratory cleaning effect on the screening bucket, and blockage of sieve pores is avoided.