The invention discloses a sludge medium temperature pyrolyzing furnace device. The sludge medium temperature pyrolyzing furnace device comprises a table frame and an incinerator body arranged on the table frame, an incineration chamber is arranged in the incinerator body, a pyrolyzing furnace body is arranged in the incineration chamber, a pyrolyzing furnace motor driving the pyrolyzing furnace body to rotate in the axial direction is arranged on the table frame, the end of the pyrolyzing furnace body is in sealed fit with the incineration chamber, a discharging end of the pyrolyzing furnace body is provided with a separation chamber which communicates with the discharging end, an air inlet pipeline being connected with the separation chamber and the incineration chamber is arranged in the incinerator body, a discharging port is formed in the lower end of the separation chamber, a secondary oxygen supply chamber is arranged in the discharging port, and the secondary oxygen supply chamber is provided with a hot smoke pipe which unidirectionally circulates to the incineration chamber. The sludge medium temperature pyrolyzing furnace device can improve the heat value utilization ratio and reduce pollution.