The invention discloses a method and a device for establishing a keyword word bank. The method comprises the following steps: analyzing item information, thereby acquiring item keywords; calculating the semantic similarity between the item keywords; generating the keyword word bank according to the item keywords and the semantic similarity; when the item information is changed, on-line updating the keyword word bank. According to the method and the device for establishing the keyword word bank provided by the invention, screening and word segmentation are automatically performed on the item data and the item keywords are acquired, so the keywords reflecting item properties are effectively extracted, redundant word groups are removed, the keyword word bank is quickly established, and the keyword word bank is dynamically updated when the item data is changed.