The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery containing 5-(trimethylsilyl)-1, 3-Cyclopentadiene additive high-pressure functional electrolyte and preparation method and application thereof. In accordance with that present invention-(trimethylsilyl)-1, 3-Cyclopentadiene additive high-pressure functional electrolyte consists of cycliccarbonate solvent, linear carbonate solvent, conductive ion lithium salt and 5-(trimethylsilyl)-1, 3-Cyclopentadiene. The invention also provides the application of the high-voltage functional electrolyte in the field of lithium ion batteries. A lithium ion battery prepare from that electrolyte of the invention has good charging and discharge performance. According to the invention, a stable protective film is formed on the surface of the cathode material during the charge and discharge process at 3-5V. On the one hand, the oxidation decomposition of high-voltage electrolyte is inhibited, on the other hand, the cathode material is protected, so that the cycle stability of high-voltage lithium ion battery is improved.