Abstract: The present invention provides a method for treating organic waste matter in a fermentation container having an shoveling conveyor, comprising the steps of: a) depositing or showering organic waste matter into an entry port of the fermentation container which contains at least one of crushed wooden materials and natural fibers, and incinerated ash thereof; b) transporting the organic waste matter toward an exit port of the fermentation container by the shoveling conveyor; c) unloading the treated matter from the container at the exit port; and d) redepositing the treated matter into the container at the entry port together with untreated organic waste matter. According to the present invention, organic solid waste matter does not overflow the container. Accordingly, there is no need of post-treatment of organic solid waste matter.