A clamping holder configured to arrange a display on a standing board defining a thickness direction is provided. The clamping holder includes a body, a connecting member, a first clamping member, and a second clamping member. The connecting member is disposed on the body and is connected to the display. The first clamping member is disposed on the body. When the body abuts against a side of the standing board and the second clamping member is assembled with the first clamping member, the second clamping member slides relative to the first clamping member in the thickness direction, such that the second clamping member abuts against the other side of the standing board, and the second clamping member and the body clamp the standing board together.