The invention discloses a detection method and device of promotion information and relates to the technical field of text filtering processing. The method comprises the following steps: obtaining a pre-set sample set and extracting an information unit of each sample in the sample set; counting the occurrence number of each information unit in the sample set, and determining the information unit with the occurrence number which is more than a pre-set first threshold value as a candidate feature unit; in view of each candidate feature unit, counting a distribution condition of the candidate feature unit in each document position; determining whether the candidate feature unit is a promotion feature unit or not according to a statistical result; detecting the promotion information in a detection document according to the determined promotion feature unit. Visibly, the detection method and device of the promotion information can be used for effectively and accurately filtering advertisement information or garbage promotion information, so that a machine grasping method can also extract pure news content and the efficiency of compiling news of owned media platforms is extremely improved.