The invention discloses an uncovered data self-destruction device for a safety payment terminal and a method. The uncovered data self-destruction device for the safety payment terminal comprises a microprocessor, a memorizer, at least two contact points and at least one photosensitive tube detection circuit, wherein parts, corresponding to the contact points, of a front housing and a back housing of the safety payment terminal, are coated with conducting resin. The uncovered data self-destruction device for the safety payment terminal and the method are easy to implement, high in safety and low in cost.