The invention discloses a card-swiping intelligent power purchasing system used for a smart grid. The system comprises a card-swiping power purchasing device and an integrated control box mutually connected through a wireless network, the integrated control box is provided with automatic controllers, each automatic controller comprises an adjusting seat, a power-connecting seat, and a control seat, the adjusting seat comprises a sealing sleeve, two ends of the sealing sleeve are provided with elastic films, the center of the top end of the elastic film at one end is provided with a connecting rod, the sealing sleeve is separated to a first filling cavity and a second filling cavity through a separating plate, the first filling cavity and the second filling cavity are filled with liquid, the separating plate is provided with two adjustable check values with opposite directions, the power-connecting seat comprises an insulation sleeve, an insulation seat is arranged in the insulation sleeve, the insulation seat is provided with two conductive heads, the lower end of the insulation seat is connected with a slide disc through a compression spring, the slide disc is provided with a conductive seat, the control seat comprises an installation sleeve, a magnetic conductive disc is arranged in the installation sleeve, and the upper end and the lower end of the magnetic conductive disc are provided with electromagnets. According to the system, power purchase with a single meter and multiple cards can be realized, power purchase is rapid and convenient, the power consumption is low, and the structure is stable and reliable.