The utility model discloses a protection and anti-interference device for an outgoing line of a tap. The protection and anti-interference device comprises a flexible metal corrugated pipe connecting component, a hard pipeline connecting component, a second metal corrugated pipe and an end head, wherein the flexible metal corrugated pipe connecting component is composed of a first metal corrugated pipe and connectors at two ends of the first metal corrugated pipe; an inner thread is arranged inside each connector; an axial through hole is formed in a rear seal plate; two end parts of the first metal corrugated pipe respectively pass through the through holes in the two connectors; a limiting lug boss is formed inside a barrel; the hard pipeline connecting component is provided with a central cavity, and comprises a first outer thread section, a lug boss section and a rear connecting section; the first outer thread section is connected with one connector through a thread; the rear connecting section is coaxially provided with an annular clamping slot outside the central cavity; a spiral thread matched with the metal corrugated pipes is arranged on the inner ring wall of the clamping slot; the front end of the second metal corrugated pipe is screwed on the inner ring wall of the clamping slot; the barrel is provided with an inner spiral thread matched with the second metal corrugated pipe and screwed at the rear end of the second metal corrugated pipe; the through holes are formed in the rear seal plate along the axis. The device can protect an outgoing line so as to ensure good grounding of the tap, and is reliable to insulate, sealed, and durable so as to ensure the safe operation.