The invention discloses an oil, water and sludge separation device. The oil, water and sludge separation device comprises a separator shell, an electrostatic generator, a backwashing device, and an oil collector, wherein the separator shell is internally provided with a separation partition, one side of the separation partition is a water inlet region, the other side of the separation partition is an oil water separation region, the bottom is a sludge sedimentation region, the sludge sedimentation region is below the water inlet region and the oil water separation region and is communicated with the water inlet region and the oil water separation region, the side wall of the water inlet region is provided with a sewage inlet, the bottom of the sludge sedimentation region is provided with a sludge discharge port, the oil water separation region is provided with a separation sloping plate and an electrostatic metal filter net, the separation sloping plate is arranged above the electrostatic metal filter net, the electrostatic metal filer net is connected with the electrostatic generator, the side wall of the lower part of the oil collector is provided with an oil discharge port, and the bottom of the oil collector is provided with a liquid discharge port. The oil, water and sludge separation device has a novel structure, can separate oil, water and sludge efficiently, can realize multiple separation, and does not damage the oil molecular structure in oil water separation and recycling process.