The invention relates to the technical field of fruit processing machinery, in particular to an automatic banana slicing machine. The automatic banana slicing machine comprises a machine frame, a slicing device, a conveying device and a control module, wherein the slicing device is transversely fixed to the machine frame and provided with multiple circular saw blades, and the distance between every two adjacent circular saw blades is equal to the thickness of a banana slice; the circular saw blades are connected with a rotating shaft, and the conveying device is movably installed on the machine frame and longitudinally moves along the machine frame; a banana frame is arranged on the conveying device, a large quantity of bananas can be put into the banana frame at a time, the banana frame is provided with multiple longitudinal saw blade notches, and each saw blade notch is aligned with one corresponding circular saw blade; switching-on and switching-off of the slicing device are controlled by the control module, and then the conveying device is controlled to move forwards and backwards; a large quantity of bananas are put into the banana frame at a time, a slicing machine switch isstarted, and then the whole slicing process can be controlled by a controller; and the large quantity of bananas in the banana frame are sliced into banana slices at a time, and the automatic banana slicing machine is simple in structure, convenient to operate and high in machining efficiency.