Phase-measuring teaching instrument

The invention provides a phase-measuring teaching instrument, which comprises a frequency converter, a state control box and a phasing hole box; the frequency converter, the state control box and thephasing hole box are electrically connected in sequence; the frequency converter is used for converting single phase electricity to three-phase electricity; the state control box is provided with three input ports and six output ports; the phasing hole box is provided with six jacks; the three input ports are electrically connected with the corresponding three-phase output ports of the frequency converter respectively, and the three input ports are electrically connected with three of the six output ports respectively; the three input ports can be electrically connected to one of the rest of the six output ports respectively in selective and disconnected mode, the six output ports are electrically connected with the six corresponding jacks; the state control box is used for adjusting the electrical connection rela