Expansion card

The invention discloses an expansion card. A main control chip, an internal memory storage chip and a hard disk storage chip which is connected with the main control chip are arranged on the expansion card, a first plate edge connector which is inserted in an internal memory slot of a main board is arranged on the bottom edge and comprises a first power supply pin which is connected with the internal memory storage chip, the hard disk storage chip and the main control chip, a first grounded pin and a first signal pin which is connected with a first storage chip, an extension plate body extends out along the side edge of the plate body, the extension plate body and a plate body are coplanar, a second plate edge connector is arranged on the extension plate body and comprises a second signal pin which is connected with the main control chip and a second grounded pin, and the second plate edge connector is in communication with a storage device interface on the main board. The expansion card is low in cost, and the situation that the space of the internal memory slot of the main board is excessively occupied is avoided.