The invention discloses a three-way shock isolation device for a satellite. The three-way shock isolation device mainly comprises a frame body, a cover plate, a bottom plate and four energy absorption material blocks, wherein the cover plate is mounted on the frame body, and is in surface contact with the frame body; the cover plate and the frame body relatively displace on the surface of the cover plate, so that a shock energy absorption action space is formed in the direction; the bottom plate is mounted on the frame body, and is not in contact with the cover plate; the four energy absorption material blocks are respectively mounted in four independent spaces formed by the frame body, the cover plate and the bottom plate, and are in tight fit with the frame body, the bottom plate and the cover plate. The three-way shock isolation device can bear objects subjected to shock isolation reliably and safely, ensures the mounting rigidity, the strength, the position precision and the like of the objects subjected to shock isolation, meanwhile, effectively isolates the shock transmission in three directions, ensures that the objects subjected to shock isolation are in a small enough shock environment reliably, and achieves the purpose that the objects subjected to shock isolation or shock sensitive parts are in on-track operation safely.