The invention provides a high-precision rotary table of a gapless connecting rod mechanism and capable of moving slightly. The high-precision rotary table of the gapless connecting rod mechanism and capable of moving slightly comprises a driving motor, a motor supporting base, a rotary table body, a rotary table base, a base plate and the connecting rod mechanism, wherein the connecting rod mechanism comprises a bearing a, a crank, a connecting shaft a, a connecting rod, a bearing b, a connecting shaft b, an oscillating bar and a bearing c, the output torque of the motor is used as power for the rotation of the rotary table, the output shaft of the driving motor drives the crank to rotate, the crank drives the connecting shaft a installed on the crank and then the connecting rod is driven to swing, the connecting shaft b is driven to rotate through the swinging of the connecting rod, the oscillating bar is driven to swing through the rotation of the connecting shaft b, and then the rotary table body is driven to rotate, namely the torque of the motor is transmitted to the rotary table body through the crank, the connecting shaft a, the connecting rod, the connecting shaft b and the oscillating bar, and the rotary table body is driven to rotate within the range of a certain angle through the swinging of the oscillating. According to the high-precision rotary table of the gapless connecting rod mechanism and capable of moving slightly, due to the fact that a proper transmission ratio is configured and a high-precision angular contact ball bearing is pre-tightened, bearing clearance is eliminated and accuracy is improved.