The invention provides a housing and a preparation method thereof, a display device and a terminal device. The method of preparing a housing comprises the steps of: respectively activating at least part of a surface of a first glass member and at least part of a surface of a second glass member with an acidic activation solution to form an activation surface; and allowing the activation surface ofthe first glass member and the activation surface of the second glass member to be in contact to composite the first glass member and the second glass member to obtain a housing. The method is simpleto operate, convenient and easy to implement, the binding force between the first glass member and the second glass member is high after activating treatment, the formed housing is good in strength,the internal uniformity is high, the surface of the housing is smooth and flat, the optical performances are good, the light transmittance is good, and the appearance is beautiful.