A paper feeding device includes a back plate, a first bracket, a second bracket, a shaft, and a friction roller. The first bracket is arranged on the back plate and formed of a first socket. The second bracket is arranged on the back plate and formed of a second socket. The shaft has a first end and a second end opposite to the first end. The first end of the shaft is rotatably mounted in the first socket. The second end of the shaft is rotatably mounted in the second socket. At least one of the first and second sockets is an open-ended socket for facilitating both the insertion and removal of the shaft. The friction roller wraps around the shaft for conveying a piece of paper.