A tool storing device is provided, including: a base, including a mounting side; and at least one positioning seat, including a connecting portion, an extension portion and a positioning portion, the connecting portion being connected to the mounting side, the extension portion being protrusive from the connecting portion, the extension portion including an inclined surface inclined to the mounting side, the inclined surface and the mounting side defining an included angle therebetween, the positioning portion being disposed on the inclined surface and configured for assembling of at least one tool.