The invention discloses a large-bearing heat-cutter type press release device which comprises a reel rope coiling unit, a shell, a compress separation unit, a heat-cutter module and a double-section rope. The shell comprises a compress base, a bottom press bushing, a lower press bushing, an upper compress bushing and a top compress bushing which are arranged sequentially from bottom to top; the reel rope coiling unit and the heat-cutter unit are arranged on the compress base; the compress separation unit is connected with the reel rope coiling unit through the double-section rope; the double-section rope is arranged in the shell to be contacted with the heat-cutter module; one end of the double-section rope is connected with the reel rope coiling unit while the other end sequentially penetrates rope grooves of the bottom compress bushing, the lower compress bushing, the upper compress bushing and the top compress bushing to be rewound by the compress separation unit and connected with the reel rope coiling unit. By the arrangement, requirements on large preload load can be met, and expansion of large-size expansion accessories is adapted.