External separate depressure type precision sand-proof pipe

The utility model relates to an external flow separating depressurizing type precision sand-proof pipe which belongs to a mechanical device in the petroleum industrial field. The utility model is a mechanical sand-proof device principally used for exploiting petroleum, natural gas, etc., and a protective sleeve is arranged outside the pipe. The utility model is characterized in that an outer pipe (4) is arranged outside an inner pipe (7), namely the upper end of the protective sleeve is composed of a coupling hoop (1), an oil pipe short joint (2) and an upper contact (3), the lower end of the outer pipe (4) is connected with a lower contact (6), and a filtering body (5) is arranged in the outer pipe (4). The utility model has the main beneficial effects that the utility model adopts the external flow separating depressurizing type protective sleeve and obtains the precise sand-proof effect through the multi-press layer combined filter screen, with strong sand-proof and blocking-proof abilities, simple process, low manufacturing cost and long service life.