The invention relates to a thin mouse with mode switching function, comprising a body, a battery case shell and a connection assembly; the body is provided with a plurality of keys, the battery case shell is provided with a first connecting convex column which is stretched in the body, so as to lead the battery case shell and the body to be connected, carry out rotation relative to the body by taking the first connecting convex column as axis and cause the thin mouse to be switched to the mouse mode or remote control mode; the connection assembly is arranged between the body and the battery case shell for connecting the body and the battery case and leading the battery case shell to rotate relative to the body to switch the working mode; the connection assembly comprises a first connecting piece which is arranged on the battery case shell and is provided with a first concave part and a second concave part, and a second connecting piece which is arranged on the body and is provided with a convex part, so as to realize the mouse which has angle on the surface and a remote controller flat shape and lead the mouse to close to the requirements of users.