The invention relates to a machine-moving monitoring system for mobile POS terminal and a machine-moving monitoring method for mobile POS terminal. The method comprises: a base station information acquiring step in which the mobile POS terminal acquires base station information of a current base station where the mobile POS terminal is located from the base station; an information uploading step in which a POS terminal information of the POS terminal and the base station information is uploaded when a transaction is being conducted on the mobile POS terminal; a base station location acquiring step in which an actual location information of the base station is acquired according to the uploaded base station information; a trader location information acquiring step in which a trader location information of a trader corresponding to the mobile POS terminal is acquired according to the uploaded POS terminal information; and a machine-moving determining step in which an actual distance between the base station and the trader is calculated according to the actual location information of the base station and the trader location information, and it is determined that a machine-moving behavior has occurred if the actual distance exceeds a specified distance. The invention can monitor whether a machine-moving behavior has happened effectively, quickly and accurately.