The invention discloses a liquid metal battery corrosion preventing and sealing structure and an assembling method thereof. The liquid metal battery corrosion preventing and sealing structure comprises a liquid metal battery sealing electrode, a cover plate with a liquid sealing wall, and a liquid seal tray, wherein the liquid metal battery sealing electrode comprises an electrode core which is provided with an upper transitional unit and a lower transitional unit, and an insulating unit is arranged between the upper transitional unit and the lower transitional unit; the bottom of the electrode core is connected with the bottom of the upper groove of the liquid seal tray, and the lower portion of the liquid seal tray is connected with a negative current collector; the cover plate with theliquid sealing wall is arranged on the upper transitional unit, and the liquid sealing wall extends downwards into the upper groove of the liquid seal tray; the liquid seal tray and the cover plate with the liquid sealing wall are filled with heat-cured liquid seal salt. According to the liquid metal battery corrosion preventing and sealing structure, corrosion prevention and sealing of liquid metal batteries which work for a long time at normal or high temperature, optimization of the space utilization rate of the batteries, reduction of battery preparation costs and the like can be achieved.