A phase two-way stepless precise adjustable control mechanism adopts the scheme that planet wheels are arranged on a planet wheel carrier; each planet wheel A and the corresponding planet wheel B are externally meshed mutually; the planet wheels A sleeve a planet wheel shaft A; the planet wheels B sleeve a planet wheel shaft B; a sun gear is arranged inside the planet wheel carrier; one of the planet wheels A is meshed with the sun gear; a power input shaft penetrates through the center of the sun gear; a gear ring is arranged at the outer part of the planet wheel carrier; one of the planet wheels B is meshed with the gear ring; the gear ring is fixedly connected with a power output shaft; a connecting shaft is fixed on the planet wheel carrier; the planet wheel carrier and a worm wheel are coaxially fixedly connected; the worm wheel is mutually meshed with a worm; the worm is connected with an output rotating shaft of a drive motor; a worm driving motor comprises the drive motor, a sleeve coupler and the worm; the output rotating shaft of the worm driving motor is connected with an ECU (Electronic Control Unit); the ECU is connected with an angular velocity phase sensor A and an angular velocity phase sensor B respectively. The phase two-way stepless precise adjustable control mechanism is simple and compact in structure, and higher in operation stability and reliability, and has the structure and function for dynamically and continuously adjusting input-output phases.