The utility model discloses a portable bill clamping device, which relates to the technical field of financial tax revenue, and comprises a shell mechanism, a clamping mechanism is movably connected in the shell mechanism, the clamping mechanism comprises a rotating ring, the rotating ring is rotatably connected in the shell mechanism, the side surface of the rotating ring is fixedly connected with a fixing plate, and the fixing plate is fixedly connected with a rotating shaft. The side face of the fixing plate is fixedly connected with a plurality of protection shells, and the multiple protection shells are fixedly connected together in a neat arrangement mode. The clamping mechanism is fixed in the outer shell mechanism through the rotating ring and can rotate, the protective shell is fixed through the fixing plate, the storage device can move in the protective shell, the storage device is protected through the protective shell, the sliding rail rotates in the fixing plate, and a second spring serves as a power device. And when the storage bin is located in the protection shell, the second spring is compressed, the clamping rod is clamped with the clamping block, and the storage bin can be kept in a contraction state.