High-precision integrated nuclear Venturi tube

The invention discloses a high-precision integrated nuclear Venturi tube and belongs to the field of fluid measurement. The high-precision integrated nuclear Venturi tube at least comprises an upstream straight segment, a Venturi tube body, a downstream segment, an equalizing ring, and a nozzle. The segments of the Venturi tube are all integrated forgings, and the integrated Venturi tube body is formed. An inlet round segment, a conical shrunk segment, a throat, and a conical expanded segment of the Venturi tube body are integrally forged and finished; a pressure hose is omitted; meanwhile, the quick-wearing part, which quickly wears due to impact, namely the connection of the conical shrunk segment and the throat is subjected to overlaying with hard wearable material; accordingly, the defects that segment rolling and welding of the prior Venturi tube with steel plates causes welding deformation, welding dislocation, welding safety hazards, after-welding failure of machining, misalignment of the segments, qui