The invention belongs to the field of biomedical engineering bionics, in particular to an open-type cochlear implant electrode and a preparation method thereof. The open-type cochlear implant electrode adopts an open-type electrode with a 'C'-shaped structure and is formed by 22-24 platinum 'C'-shaped open electrode rings and 22-24 platiniridium electrode wires with insulating layers which are arranged in sequence and connected in series and packaged together by silica gel, wherein the 22-24 platiniridium electrode wires with insulating layers are connected with the inner walls of the 22-24 platinum 'C'-shaped open electrode rings in a welding manner, and the platinum 'C'-shaped open electrode rings are insulated with each other. The invention not only reserves the advantages of good directivity of annular electrodes and low energy consumption of platy electrodes, but also simplifies the processing and manufacturing techniques of the electrodes, simultaneously has the advantage of easy processing of punctuate electrodes, improves the production and processing efficiency of an electrode product, promotes the quality of the electrode product, and is beneficial to batch standardized manufacture of the domestic cochlear implant.