A dual screen electronic device includes a main device having a first casing and a display screen, and a detachable display module. The first casing has a first opening. The display screen is located on the first casing and exposed from the first opening. The detachable display module includes a second casing, a power supply module, an electrophoretic display (EPD) module, and a control module. The second casing is detachably positioned on the first casing, and has a second opening. The power supply module is arranged on the second casing. The EPD module is fixed to the second casing, or is detachably positioned on the second casing, and has a display region exposed from the second opening. The control module is selectively located on the second casing or on the EPD module, and is electrically connected to the EPD module and the power supply module.