The utility model provides an oil well wellhead does not stop production and changes process device, the device include the casing, the swagelok that commutates, endocentric left collar extension, left internal orifice are seted up to casing left side, and endocentric right internal orifice, right collar extension are seted up to the casing right side, switching -over swagelok includes three -wayvalve, lower two -port valve, go up three -way valve, valve rod of lower two -port valve sharing, go up three -way valve, lower two -port valve setting in the casing, it includes the tee bend import,goes up the first export of tee bend, goes up the export of tee bend second to go up the three -way valve, the two -port valve is including bi -pass import down, bi -pass export down, go up tee bend access connection left side internal orifice, go up the first exit linkage of tee bend right side internal orifice, go up tee bend second export intercommunication casing inner chamber, the right collar extension of intercommunication is imported to the bi -pass down, the bi -pass exports intercommunication casing inner chamber down, casing inner chamber while and left collar extension, right collar extension intercommunication. The utility model discloses an oil well does not stop production high -speed joint mark and produces and hot oiling equipment.