The invention discloses a three-phase power source connector. The three-phase power source connector comprises a socket and three plug bodies hinged on a hand-held driving part; three uniformly distributed circular holes are molded in the socket; three power supply columns are fixed onto the bottom surfaces of the circular holes respectively; the plug bodies are sheathed with the circular holes respectively; each plug body comprises a stepped cylindrical body sheathed with the corresponding circular hole; power receiving sheets are sheathed with the stepped cylindrical bodies respectively; thepower receiving sheets abut against the power supply columns respectively; limiting pipes sleeve the outer sides of the stepped cylindrical bodies respectively; the left ends of the limiting pipes abut against semicircular plates respectively; the semicircular plates are fixed to the inner walls of the circular holes respectively; the limiting pipes are rotated so as to be clamped by the semicircular plates; main gears are fixed onto the stepped cylindrical bodies respectively; a pinion is fixed to the middle of the hand-held driving part through a connection shaft; and the pinion is engagedwith the three main gears. According to the three-phase power source connector of the invention, the plug bodies can be stably and reliably fixed into the socket; and the plug bodies can be inserted into the socket in a simple and efficient manner.