Provided is a sugarcane leaf crushing and returning machine comprising a transmission system, a frame, a front baffle plate, a flail chopper knife, a stationary knife, a knife roll, a rear baffle plate, a spacing wheel and a profiling leaf collector; the transmission system comprises a gearbox and a V-shaped conveyor belt; three points of the frame suspend on a wheel tractor; the flail chopper knife and the stationary knife are main work parts for crushing; the spacing wheel is a profiling wheel; the profiling leaf collector is mainly composed of a diagonal rod and a connecting board; the diagonal rod is composed of a bending rod and a bottom shovel by connecting though bolts; the diagonal rod is rigidly connected with the spacing wheel and is located on a same surface of the tractor wheels. The gap between the flail chopper knife and trenches can exceed the height of ridges, which well solves the problem that common flail chopper knife cannot pick sugarcane leaves; the machine has theadvantages of simple structure, convenient operation, small turning radius, avoiding being entangled and blocked by sugar cane leaves, high pickup rate and crushing rate, and low power consumption.