The invention relates to a fallen leaf sucking and collecting machine. A housing is arranged around an impeller, the impeller is connected with a driving mechanism, the driving mechanism drives the impeller to rotate, an air inlet is formed in the housing, an air sucking pipe is arranged on the air inlet, an air outlet is further formed in the housing and is provided with a discharging pipe, the air sucking pipe and the discharging pipe are located on the air inlet side and the air outlet side of the impeller respectively, the housing is provided with a handle convenient to hold, and a material storage bag is arranged at the discharging port of the discharging pipe. An operator holds the handle and starts the driving mechanism to drive the impeller to rotate, so that the air sucking pipe of the sucking and collecting machine faces fallen leaves on the ground, the fallen leaves are sucked into the housing and are discharged out of the air outlet formed in the housing and discharged into the material storage bag, and thus the operation intensity is reduced to the most degree.