The invention provides an automatic thread stripping device, comprising a first knife assembly, wherein the first knife assembly comprises a first base and a first knife, and the first knife can walkon the first base; A second knife assembly including a second base and a second knife, the second knife being movable on the second base; A driving portion connected to the first knife and/or the second knife to drive the first knife and the second knife to approach each other or to drive the first knife and the second knife away from each other. The present invention effectively solves the problems in the prior art that the manual stripping machine stripping operator has high labor intensity, low construction efficiency and thus leads to wire crimping and low butt joint construction efficiency.