The invention provides a handle assembly and a stapler including the same; the handle assembly includes a first handle, a second handle, a first pointer and a second pointer; the first handle is provided with a sliding chute and a sliding block; the sliding block is located at a second section of the sliding chute, and the first handle rotates in the second direction to the second handle to pressagainst the sliding block; the second handle and the first handle are linked, and the sliding block pushes a second end of the second pointer to rotate in the second direction so as to deform the second pointer. The handle assembly is divided into the first handle and the second handle; when the stapler does not reach a triggering state, the first handle can be pressed, but the second handle cannot rotate and cannot trigger the stapler; the pointer is divided into the first pointer and the second pointer, and when the first handle and the second handle rotate together, the sliding block can push the second pointer to rotate, so the pointer cannot block the rotation of the handle assembly, the smoothness of the motion of the device when the stapler is triggered is ensured, and the use experience of a user is enhanced.