To provide a structure of a web folding and stacking machine, and a web product folding and stacking method using the same.

The structure of the web product folding and stacking machine includes two folding wheels 21, two stag units 23, a first receive unit 25, a block unit 27, a flexible unit 271, and a receive table 29. The folding wheels 21 and the stag units 23 are operated to fold up and stack web products 22 on the first receive unit 25. When a stack of a predetermined number of web products 22 is finished, the block unit 27 isolates the interfolded web products 22. The block unit 27 and the receive table 29 transport the interfolded web products 22, the block unit 27 includes the flexible unit 271, and, further, the flexible unit 271 is extended out after movement of the block unit 27, so that it is advantageous for interfolding the web products 22 on the block unit 27, thereby keeping the finished stack of interfolded web products 22 in integrity.