A portable clothes dryer and a clothes drying method thereof, wherein the portable clothes dryer comprises: a casing (1) provided with air inlets (4) and air outlets; a detachable garment model (8) made of elastic material comprising an inflatable chamber, the chamber provided with an air intake port (82) through which air from the air outlet enters into, clothes to be dried putting on the garment model (8) for drying; a heating device (7) disposed inside the casing (1) to heat air; a blower (6) configured to move heated air to the chamber of the garment model (8). The overall size of the dryer can be reduced to make it easy to carry due to the garment model with the inflatable chamber is detachable and made of elastic material; the clothes to be dried could be neatly put on the garment model so the clothes dried in this manner is wrinkle-free and can be dressed immediately, and the ironing process is saved.