The invention discloses an automatic card support installation device of an electronic product. The automatic card support installation device comprises a support frame, a sliding rail, a fixed block,a card inserting mechanism, a disconnecting mechanism and a card pushing mechanism, wherein the support frame is used for fixing the electronic product, the fixed block is arranged on the sliding rail in a sliding mode and is used for installing a card support, the card inserting mechanism is used for driving the fixed block to drive the front end of the card support to be inserted into a card slot of the electronic product, the disconnecting mechanism is used for disconnecting the fixed block from the card support after the front end of the card support is inserted into the card slot, and the card pushing mechanism is used for completely pushing the card support into the card slot after the fixed block is disconnected from the card support. According to the automatic card support installation device, firstly, the fixed block is driven by the card inserting mechanism, so that the front end of the card support is preassembled with the card slot, then the fixed block is disconnected from the card support by the disconnecting mechanism, and finally, the card support is pushed by the card pushing mechanism, so that the card support is assembled with the card slot. Compared with the prior art, the automatic card support installation device has the advantages that the card support on the electronic product is conveniently and efficiently installed, the card support is effectively prevented from being scratched, the installation efficiency is improved, and the end product quality is increased.