A removable power supply system is proposed, which includes a power supply and a power supply adapter. The power supply adapter is fastened and electrically connected to the power supply. The power supply is provided with a first electrical connection portion and a first fastening portion. The power supply adapter is provided with a second electrical connection portion electrically connected to the first electrical connection portion and a second fastening portion fastened to the first fastening portion. In so doing, not only are the power supply and the power supply adapter fastened together, but individual power supply adapters are independent of each other, thereby solving the drawbacks of the prior art.