Disclosed are an integrated circuit device and a formation method thereof. The formation method of an integrated circuit device comprises the following steps: providing a substrate, wherein a first plug and a second plug are disposed inside the substrate; forming a first covering layer covering the substrate; forming, in the first region, a first opening exposing the first plug; forming a first conductive layer in the first opening; forming an isolation layer covering the first conductive layer and the first covering layer; forming, in the first region, a contact hole exposing the first conductive layer and a trench located above the contact hole and connecting with the contact hole, and forming, in the second region, a second opening exposing the second plug; and forming a conductive connection layer in the contact hole, forming a second conductive layer in the trench, and forming a fuse wire in the second opening.