The utility model relates to a bidirectional power swivel device for a multifunctional testing machine, comprising a motor and a central pipe, wherein the central pipe is fixedly connected with a load bearing casing by a tensile bearing main bearing, and the upper part of the central pipe is communicated with a flowing liquid gooseneck through a washing pipe. The bidirectional power swivel device for a multifunctional testing machine is characterized in that a pressure-bearing main bearing is additionally arranged between the load bearing casing and the central pipe; the center of the central pipe is provided with a flowing liquid hole, and a lower centering bearing is arranged between the lower part of the central pipe and the load bearing casing; and the upper part of the central pipe penetrates through the center of a transmission gearwheel of a transmission box body and is fixedly connected with the transmission gearwheel, the transmission gearwheel is meshed with a transmission pinion, and a pinion shaft of the transmission pinion is connected with the motor through a torque rotation speed sensor. The bidirectional power swivel device can be widely applied to multifunctional testing machines for simulation tests of various petroleum drilling and production downhole tools, and can measure the test torque and the rotation speed values in real time; and the bidirectional power swivel device for a multifunctional testing machine can satisfy the requirements of applying a rotation torque to a downhole tool in test and bearing tensile or pressing testing loads during high-pressure, high-temperature and liquid flowing circulation, and can well satisfy the needs of petroleum drilling and production tool downhole simulation tests.