A loading apparatus for an exercise machine mainly includes a motor and a controller. The motor is connected to an exercise apparatus, on which a user may take exercise, of the exercise machine through a transmission device. The controller has a circuitry, which has at least a resistor, has opposite ends connected to the motor and a switch in the circuitry. Whereby, when a user takes exercise on the exercise apparatus of the exercise machine, it will turn a rotor of the motor through the transmission device to generate an induced current. The induced current flows through the circuitry and back to the motor to drive the rotor turning reversely. It provides the exercise apparatus a brake to make user taking exercise with a loading.