A supporting mechanism for an electronic device includes a connecting bracket configured to connect to the electronic device and a supporting bracket connected to the connecting bracket and configured to support the electronic device. The supporting bracket includes a supporting portion having a receiving space, a locating member received in the receiving space, a supporting plate, and a resilient sliding member engaged in the locating member. A sliding slot is defined in the locating member. The resilient sliding member is secured on the supporting plate through the sliding slot. The resilient sliding member is compressed to disengage from the locating member, and slide in the sliding slot with the supporting plate relative to the locating member and the supporting portion along an extending direction of the supporting portion to change a length of the supporting bracket.