The invention relates to a plastic seal pressing-in material for eliminating blast furnace gas blowby, which is characterized by being formed by combining plastic seal pressing-in material, long-term plastic sealant and high-strength fast hardening self-flow castable. The plastic seal pressing-in material can be pressed in larger furnace gaps at different blast furnace gas blowby positions, and the material can keep certain plasticity at low temperature, effectively fill in the gaps to play a role in plugging a gas blowby channel, and automatically harden and keep the volume stable and unshrinking; a furnace foundation part is manufactured into a labyrinth seal structure, and a gas exposed channel is plugged by using the long-term plastic sealant; the high-strength fast hardening self-flow castable is cast outside a long-term plastic seal material to level so that a seal solidifying role is played; and the three materials are combined for application so that multi-plugging for the gasblowby channel is formed, the gas blowby channel is effectively plugged, a new blowby channel is not easy to form, and therefore, the aim of fundamentally solving the problem of the blast furnace gasblowby is achieved.