Workpiece holder used for surface treatment

A workpiece holder used for surface treatment comprises a bearing platform and plural clamping pieces. The bearing platform is provided with a fixing plate and a lifting plate. The lifting plate can be arranged above the fixing plate in an up and down displacement mode and a plural punched holes are formed in the lifting plate. Each clamping piece is provided with two elastic arms. The two elastic arms are fixed on the fixing plate of the bearing platform through the bottoms of the two elastic arms and penetrate through the punched holes of the lifting plate to protrude from the lifting plate. Therefore, when the lifting plate descends or ascends corresponding to the fixing plate, the elastic arms of each clamping piece can be pressed by the hole walls of the punched holes which penetrate the lifting plate to generate elastic stretch or closing up of each other and workpieces of each clamping piece which are sleeved on each clamping piece can be held tight or released to achieve the effect of convenient automatic baiting.