The invention discloses a fallen leaf sweeper. The fallen leaf sweeper comprises a chassis, a driving system and a master dust collection box are arranged on the chassis, a front wheel and a rear wheel are arranged below the chassis, the driving system drives the front wheel to rotate, a main sweeping brush is arranged between the front wheel and the rear wheel and below the chassis, a tree leaf collection device is arranged at the front end of the front wheel and comprises a collection box, a hopper is connected to an inlet of the collection box and is connected to the side face of the collection box rotationally, an extension tooth is arranged at the end of the hopper, a protective cover is arranged above the inlet of the collection box, a shearing device is arranged at the inlet of the collection box, a suction fan is arranged in the collection box, the upper end of the collection box is connected to the master dust collection box through a connecting passage, and a lifting mechanism is arranged in the connecting passage. The fallen leaf sweeper has the advantage that the tree leaf collection device is arranged at the front end of the sweeper, and tree leaves on the ground are collected thoroughly before the main sweeping brush operates, so that normal use of the fallen leaf sweeper affected by jamming of the three leaves is avoided.