Pitot-tube differential pressure type flow sensor

The utility model discloses a Pitot-tube differential pressure type flow sensor. The Pitot-tube differential pressure type flow sensor comprises a cylindrical pressure guide pipe and a pressure extracting head which is arranged below the cylindrical pressure guide pipe and is connected with the cylindrical pressure guide pipe, wherein the pressure extracting head comprises a cylindrical connector of an upper section and a pressure extracting head body of a lower section, the cross section of the pressure extracting head body is waterdrop-shaped, a total-pressure passage and a static-pressure passage are respectively formed at the head and tail of the waterdrop-shaped pressure extracting head body, total-pressure flow guiding passages and static-pressure flow guiding passages, which are communicated with the total-pressure passage and the static-pressure passage, are respectively formed at the head and tail of the lower part of the waterdrop-shaped pressure extracting head body, and the axis of the total-press