The invention discloses a method for positioning card retaining and account errors of self-service equipment, a system and equipment. According to the implementation mode, the method comprises the steps that a card number of a client and the trading hour are acquired; card retaining information is inquired according to the card number; the self-service equipment which retains a card is positioned according to the inquired card retaining information. On the basis of the implementation mode, a customer service staff can quickly position the card retaining and account error problems generated in the self-service equipment through a self-service equipment monitoring and managing system; the problem positioning time is greatly shortened compared with the prior art, the method is beneficial for pacifying the emotion of the client, and the client satisfaction is improved.