The invention provides a high-
voltage incoming cabinet with a self-locking function and a working method of the high-
voltage incoming cabinet. The high-
voltage incoming cabinet comprises a
circuit breaker chamber; the interior of the
circuit breaker chamber is provided with a rear side wall, a left side wall and a right side wall, wherein the rear side wall is provided with a second contact groupand a first
contact group disposed sequentially along a vertical direction; the high-voltage incoming cabinet further comprises a covering component, a limiting component, a first
assembly and a second
assembly; the first
assembly includes a first rotating component, a second rotating component, a first connecting component, a second connecting component, a first
wrench, a second
wrench, a blocking component, a
handle, a spring and a
torsion spring; one end of the spring is fixed, and the other end of the spring is disposed on the
handle; the connecting point of the spring and the
handle and the operating portion of the handle are respectively located at two sides of a second rotating shaft; the first rotating component is connected with the
torsion spring; and the
torsion spring sleeves afirst rotating shaft. The high-voltage incoming cabinet of the invention has the advantages of simple structure, reliable work, good protection effect and the like.