The invention discloses a safety injection container for a nuclear power plant and a safety injection system. The safety injection container comprises a shell, a fluid barrier device and a safety injection orifice, wherein the fluid barrier device is arranged in the shell and is used for obstructing mixing of cold fluid and hot fluid contained in the shell; a fluid channel is formed in the fluid barrier device; the cold fluid and hot fluid is communicated through the fluid channel; the safety injection orifice is formed in the shell and is in fluid communication with a safety injection pipe for supplying fluid to the exterior; and the safety injection orifice is formed below the fluid barrier device. According to the safety injection container and system disclosed by the invention, the temperature difference between the cold fluid and hot fluid in the safety injection system in the nuclear power plant or a test bed can be enhanced, so that the water temperature at the safety injection phase approaches to an ideal value for the safety of the nuclear power plant, the reactor core flooding and cooling capacity is further improved, and the nuclear power safety is improved.