A portable barrel for containing beverage includes a barrel body, an inner tank, a barrel lid and an adjusting tray. The barrel body has a receiving recess. The inner tank is mounted in the receiving recess of the barrel body and has a tank body and a pouring cap mounted on the tank body. The barrel lid is mounted on the barrel body and covers the pouring cap of the inner tank. The adjusting tray is mounted on the barrel lid and connects with the inner tank. The barrel body and the barrel lid can keep the inner tank cooled for a long time. The adjusting tray can be rotated to move upward, such that a channel is formed between the pouring cap and the adjusting tray to easily pour the beverage out from the inner tank.