Oxidation film porcelain tube resistor

The utility model provides an oxidation film porcelain tube resistor which comprises leads, end caps, a matrix, a membrane layer and an insulating layer. The membrane layer is plated on the matrix. The end caps are pressed at the left and right ends of the matrix plated by the membrane layer. A spiral slot is cut in the matrix plated by the membrane layer. The leads are respectively connected to the end caps. The insulating layer is coated above the membrane layer. The leads are tinned copper wires and tin-coated copper-clad steel wires. High temperatures wire can be further arranged on the leads. The end caps are made of copper plate tin or iron plate tin. The matrix which is a hollow cylinder is made of ceramic. The membrane layer is a carbon membrane layer, an oxidation film layer or a vitreous glaze membrane layer. The insulating layer is an organic coating or an epoxy resin coating. The resistor provided by the utility model has the beneficial effects of uniform calorific value, stable performance of pro