I don't see how - if more people stop buying Chinese goods (e.g. shitty plastic toys that you don't need), then they might do something different than feed the West's desire to spend and consume.
There are a few ideas that at least won't hurt, but the possibility exists that the working conditions of Chinese factory workers is not within your sphere of influence.
The obvious way to achieve minimum working conditions is legislation. Many believe this would be counter productive. I'm not certain.
In any case, refusing to purchase from them and 'buying local' instead denies those workers that job. Doing this does not improve their situation.