The invention provides a movable intelligent exhaust gas self-circulation biomass carbonizing device in the technical field of biomass carbonizing. The biomass carbonizing device comprises a protection gas cylinder, a natural gas cylinder, a carbonization furnace provided with an accommodating cavity, a tar collecting device and an exhaust gas recovery device, wherein a heat insulation layer is arranged between the outer wall and the inner wall of the carbonization furnace, the bottom of the carbonization furnace is of an inward concave structure capable of accommodating a burner, a carbonizing frame is arranged in the carbonization furnace, and a combustion tray is connected to the burner; the protection gas cylinder is connected with an inner cavity of the carbonization furnace through a protection gas channel, the natural gas cylinder is connected with one end of the burner through a natural gas channel, the other end of the burner is connected with one end of a self-produced fuel gas channel, the other end of the self-produced fuel gas channel is connected with the exhaust gas recovery device, the carbonization furnace is connected with the tar collecting device through a tar channel, the tar collecting device is connected with one end of an exhaust gas channel, and the other end of the exhaust gas channel is connected with the exhaust gas recovery device. The biomass carbonizing device is high in carbonization rate, high in carbonizing quality and capable of avoiding environment pollution, and can be applied to biomass carbonizing.