Smart card connection circuit of electronic device and electronic device

A smart card connection circuit of an electronic device, comprising;

• a card holder;
• a travel switch;
• and
• a switching unit,
• wherein a power cable pin and each signal cable pin on the card holder are connected to corresponding interfaces at an input end of the switching unit,
• wherein a contact of the travel switch is located in the card holder, and an output end of the travel switch is connected to a control end of the switching unit, and
• wherein the smart card leaves the contact of the travel switch, the travel switch controls the switching unit to switch to a second output end, and each signal cable pin on the card holder is grounded by using the switching unit before the power cable pin on the card holder is grounded by using the switching unit when a smart card at a preset position in the card holder leaves the preset position.