A fixing auxiliary device includes a support frame, an elastic member, and a plurality of first support members. The first support member includes a first segment, a second segment, and a third segment which are connected in sequence. The third segment is detachably connected to the support frame, the first segment is configured to extend into a first component. An end of the second segment facing away from the third segment includes a first stop surface configured for stopping the first component from moving towards the support frame. The elastic member is configured to provide an elastic force to a second component to press against the support frame.