A 3-in-1 charger with a watch charger as a portable battery. The watch charger can be separated and used as a portable auxiliary battery, so it can be easily carried out and charged when traveling or going out. When a watch charger is mounted on a device, it can be used as a 3-in-1 charger, and the charger seating part rotates at a 90-degree angle considering usability, providing various usability. The soft and flat design is designed with a simple sensibility that can be easily melted in any space.