The invention relates to a protective device of an ignition wire in the high-pressure water jet cleaning solid rocket engine charging process, belongs to the technical field of engine charging, and particularly relates to a device capable of protecting the ignition wire against high-pressure water jet mechanical injury and damage caused by waste water corrosion and the like. The high-pressure water jet cleaning solid rocket engine charging ignition wire protective device is installed at a port of an engine and comprises a connecting ring and a water retaining ring; a jet passage is arranged inthe center of the water retaining ring, and a clamping groove used for installing a seal ring is formed in the outer wall of the jet passage; the connecting ring is installed at the port of the engine, and an outer ring is attached to the outer wall of the engine; the water retaining ring is fixedly connected with the connecting ring, the jet passage is located in the engine, and seal is formed between the seal ring and an annular boss in the engine. Accordingly, by arranging the water retaining ring on the engine ignition wire part, the phenomenon that the wire is damaged by high-pressure water jet is prevented; the seal ring is arranged at the water retaining ring and a step in an engine shell, and the phenomenon that cleaning waste water corrodes wire metal is prevented.