A statistical method and device for customer flow volume. The method comprises: obtaining video image information in a preset monitoring area; performing video analysis on the video image information and determining a movement direction of a first target person appearing in the preset monitoring area according to an analysis result; obtaining, through statistics, incoming or outgoing customer flow volume of the actual detection area according to the determined movement direction of the first target person; reading a first terminal identifier, detected by a WiFi detector, of a WiFi terminal apparatus carried by the first target person; judging whether the first terminal identifier is present in a preset terminal identifier database for non-customer personnel; if so, decreasing the incoming or outgoing customer flow volume by 1; otherwise, making no change to the incoming or outgoing customer flow volume.