A plasma reactor for abating hazardous materials by decomposing various hazardous materials in a front end part of a vacuum pump is provided. A plasma reactor for abating hazardous materials includes a ground electrode part, an insulator, and a driving electrode. The ground electrode part includes a first ground electrode located in a front end part of the vacuum pump and having a tubular shape, including a first end part facing the vacuum pump and a second end part at an opposite side thereof, and a second ground electrode connected to a side of the first ground electrode and having a tubular shape and transferring the process gas. The insulator is connectedly installed to the second end part. The driving electrode is fixed to an outer surface of the insulator, a driving voltage is applied while being connected to a power supply, and low pressure plasma is generated inside of the first ground electrode due to a voltage difference from the ground electrode part.