The invention relates to a device and a method for simultaneously recycling heavy metal in wastewater of an electroplating industrial park and treating sludge and sewage in the park, relates to a method for simultaneously recycling heavy metal and treating sludge and sewage, and aims to solve the technical problem that the existing method for processing electroplating wastewater by microbial fuel cells is difficult to recycle heavy metal. The device comprises a first biological anode chamber, a biological cathode chamber, a sedimentation area, a chemical cathode chamber and a second biological anode chamber which are sequentially arranged; the device also comprises an external electric storage device or an electric appliance; each chamber is provided with a graphite brush electrode, a vent hole and a water outlet hole; in addition to the graphite brush electrode of the chemical cathode chamber, the graphite brush electrodes of other chambers are provided with functional bacteria, the electrodes are connected through the electric storage device or the electric appliance into a closed loop. The method comprises the following steps of putting sludge in the first biological anode chamber and the second biological anode chamber and sealing, putting a cathode medium into the biological cathode chamber, adding the electroplating wastewater into the chemical cathode chamber, and adding clear water to the sedimentation area; performing aeration in the biological cathode chamber and replacing the cathode medium, sludge and electroplating wastewater timely to complete the treatment.