Nuclear fusion devices are commonly referred to as "artificial suns". However, mainstream tokamak devices at present differ drastically from real stars in both structure and operating principles, and fail to exert the inherent high thermal efficiency advantage of nuclear fusion. Such devices generally suffer from low thermal energy utilization efficiency, rapid heat dissipation of plasma, waste of neutron energy, and high construction costs. Starting from the natural fusion laws of stars, this paper points out that stars have an enormous temperature difference between their core and surface, and are inherently stable non-equilibrium systems. The high temperature required for nuclear fusion is not merely a technical challenge, but rather a favorable condition for improving power generation efficiency. Accordingly, this paper proposes a novel idea of mechanically confined non-equilibrium nuclear fusion: confining fusion matter via the mechanical pressure of a high-pressure shell; constructing a gradual temperature structure with high temperature at the center and low temperature near the vessel wall through non-equilibrium heating by focused ultrasonic waves; stabilizing the gradual temperature structure by the centrifugal force of rotating gas; and using fusion matter in a thermal non-equilibrium state as the direct working fluid to perform work, eliminating the conventional heat exchange links. In this paper, simplified device models are presented to illustrate the equipment structure and operation process. The advantages of the scheme in terms of plasma density, energy confinement time, neutron energy utilization, work efficiency and engineering cost are demonstrated through comparative analysis. Meanwhile, two new developments, namely ignition method and material hydrogen embrittlement, are identified. this article providing a new theoretical approach for nuclear fusion technology.This article is an English translation of the original Chinese paper. The original Chinese link is: https://doi.org/10.6084/m9.figshare.32801733