Leaked liquid storage device

The invention provides a leaked liquid storage device, which belongs to the technical field of onboard fuel tank inerting, and comprises a containing cavity 1, a locking screw and nut assembly 3, a liquid discharge nozzle 4 and a plug cap assembly 5, wherein the containing cavity 1 is of a cylinder structure, a flange plate connector is reserved in the upper end face and used for being connected with a reserved installation face of a pipeline shell, and a thin pipe is arranged on the upper end face and extends into the containing cavity; a flange connector is reserved on the lower end face and used for being connected with a liquid discharging nozzle 4; the liquid discharge nozzle 4 and the accommodating cavity 1 are fastened by the locking screw and nut assembly 3; the device can prevent fuel oil from seeping slowly to pass through a one-way valve to pollute an airborne inerting system, meanwhile, stored leaked liquid cannot flow back under different flight attitudes, and the device can be widely applied to