A removable cover assembly for sealing an opening of a housing includes a case, a latch, and an elastic member. The latch is movably disposed in the case, and includes a connection portion, a push portion, and a latching portion. The connection portion is disposed along a moving axis. The push portion is disposed at one end of the connection portion and exposed out of the case through an operation hole. The latching portion is disposed at the other end of the connection portion, and has a first position to protrude out of the case through an aperture and a second position to be retracted in the case. The elastic member is disposed in the interior space for pushing the latch along the moving axis, such that the latching portion protrudes out of the case consciously, thereby fixing the removable cover assembly to the housing and sealing the opening.