Does multiple domain redirection affect SEO?

[t-wins]

This is NOT going to help. If it does, you would have seen people redirecting domain names like crazy. When you buy new domain names, those domains/websites have little credibility. So, search engines would not consider them as valuable links. Also, this may be flagged by search engines as spam. I'd stay away from doing something like this.

[rayter]

From an SEO perspective, creating unique sites is better, instead of making redirect. This won't help you get better ranking.

[moo baa]

It wont help, the idea was abused a number of years ago and as such the value of doing so dropped and was frowned upon by Google, so its not something I would do.