Gearboxes used in the drivetrain of intelligent robots are key mechanical components that play a significant role indetermining the performance of modern robotic systems. Gearboxes employing the planetary gear mechanism, knownto achieve a wide range of reduction ratios while remaining relatively cost-effective, have recently been adopted inrobot drivetrains. In this paper, we utilize domestic technology to fabricate a gearbox using a compound planetarygear mechanism and conduct an evaluation of eight performance aspects of the developed gearbox through thefabrication of a dynamometer and a jig. The dynamometer comprised of the gearbox, input motor, input-output torquesensors, and a powder brake. By driving the input motor and applying braking force with the powder brake, wecompare input torque sensor values with output torque sensor values to derive results. A test jig is created,consisting of an input motor, gearbox, and encoder sensor, for the measurement of inverse operation characteristicsand backlash. By conducting a performance evaluation of the developed high-strength, high-reduction-ratio compactplanetary gearbox, we validate the potential of the testing system and extend the scope of domestic gearboxtechnology development.