Reusable multifunctional multiphase extraction well head

The utility model discloses a reusable multifunctional multiphase extraction well head which comprises a three-way pipe fitting, a sealing connecting piece is fixed to a lower communicating opening of the three-way pipe fitting, a bypass opening of the three-way pipe fitting is connected with an air exhaust connector through an air exhaust pipe, and a first valve is installed on the air exhaust pipe. An upper communicating opening of the three-way pipe fitting is closed and fixed to the washing connecting pipe, a lower pipe opening of the washing connecting pipe extends into the three-way pipe fitting, an upper pipe opening of the washing connecting pipe is connected with a lower communicating opening of the first communicating connector, and a first side communicating opening of the first communicating connector is connected with the water pumping and medicine injecting connector through the second valve. Under the condition that a well head does not need to be replaced, a water pumping function, a medicamen