Blowout-preventing and leakage-preventing pipeline valve protecting device

A blowout-preventing and leakage-preventing pipeline valve protecting device comprises a protecting cover which is arranged on a pipeline in a surrounding-sleeved mode and wraps a flange or a welding line portion on the pipeline. The lower portion of the protecting cover is connected with at least one flow guiding pipe which is provided with a detachable liquid collecting bottle. Inward rolling rims are arranged on the edges of pipeline holes in the two sides of the protecting cover. The bottom end of the lower portion of the protecting cover is connected with a flow guiding pipe which is arranged downwards vertically. The end of the flow guiding pipe is connected with the liquid collecting bottle in a screwing mode through a thread sleeve. At least one layer of pipeline heat preservation structure wraps the protecting cover. The protecting cover is formed by an upper half cover body and a lower half cover body in a combining mode. A fastening piece is arranged between the two half cover bodies which are fixe