1. A system for filtering keywords, which comprises: a text acquisition module configured to acquire text content to be filtered; a scanning module configured to scan the text content to be filtered through a preset keyword dictionary, if the text content to be filtered contains keyword(s) stored in the preset keyword dictionary, record a position of each keyword in the text content to be filtered and acquire character pitch between keywords in the text content to be filtered according to the position of each keyword in the text content to be filtered; and a judging and filtering module configured to judge whether the character pitch exceeds a preset character pitch, if not, filter the keyword(s) in the text content to be filtered.