The invention provides a knife switch sheath. The knife switch sheath is simple in structure and convenient to machine, and the safety of the knife switch sheath is improved. The knife switch sheath sequentially comprises a vertically arranged cover body and a horizontally arranged tube body. The cover body is provided with a central hole, and a big-end-up stepped cylinder. The cover body is provided witha branch body 1 and a branch body 2. The outsides of the branch body 1 and the outside of the branch body 2 are respectively provided with a connecting edge 1. The tube body is provided with abranch tube 1 and a branch tube 2. The top of the branch tube 1 and the top of the branch tube 2 are respectively provided with a connecting edge 2. The branch body 1 and the branch body 2 are formedintegrally. The branch tube 1 and the branch tube 2 are formed integrally. A sealing rubber strip is respectively arranged between the two oppositely arranged connecting edges 1, and the two oppositely arranged connecting edges 2. The outside of the tube body is provided with a branch tube. The knife switch sheath is convenient to install and machine, safe and reliable.