Stentering mechanism and tentering setting machine

The invention provides a tentering mechanism and a tentering setting machine, the tentering mechanism comprises two conveying chains which are horizontally arranged on two sides of a rack respectively, the running directions of the two conveying chains are opposite, and a cloth channel is formed between the two conveying chains; a plurality of cloth clamping assemblies are distributed on each conveying chain at intervals, and the cloth clamping assemblies are used for clamping the edge of cloth when moving to the cloth channel along with the conveying chains; negative pressure air rails are arranged below the sides, close to each other, of the two conveying chains, and an air hole array is arranged in each cloth clamping assembly. Each cloth clamping assembly abuts against the negative pressure air track on the corresponding side in a sealed mode when walking to the cloth channel, so that the air hole array is communicated with the negative pressure air track, and negative pressure adsorption force is formed