The invention relates to an environment-friendly leaf collecting and burning device. The device comprises a burning device main body, a purification tank, a gas outlet, a combustion chamber, a pipe and traveling wheels, wherein a feed pipe is arranged in the middle of the upper end of the burning device main body, a cover is arranged on the upper part of the feed pipe, a handle is connected to theupper end of the cover, and an exhaust pipe is arranged outside the handle; the purification tank is connected to the upper end of the exhaust pipe, a trough is arranged inside the purification tank,activated carbon is arranged inside the trough, and the gas outlet is formed in the upper end of the purification tank; the combustion chamber is fixed inside the burning device main body, a hydraulic cylinder is fixed at the top end inside the combustion chamber, a connecting rod is connected to the bottom end of the hydraulic cylinder, a knocking rod is connected to the bottom end of the connecting rod, and a knocking ball is connected to the tail end of the knocking rod. The environment-friendly leaf collecting and burning device has the beneficial effects that collection of leaves is integrated with later treatment, and efficiency is improved.