Whiteboard writing pen capable of being filled with ink

The utility model relates to the technical field of whiteboard pens, discloses a whiteboard writing pen capable of being filled with ink, and solves the problems that the ink in the whiteboard writing pen in the current market is mostly adsorbed on sponge and stored, and cannot be filled into the whiteboard pen, so that the whiteboard pen cannot be continuously used after writing for a period of time, and the ink cannot be filled into the whiteboard pen. The writing pen comprises a writing pen container and a pen container cover, an ink inner barrel is movably inserted into the writing pen container, a writing pen holder is movably inserted into one end of the writing pen container, one end of the writing pen holder penetrates through the writing pen container and is inserted into the ink inner barrel, and a rubber sealing sleeve is fixedly connected to the outer portion of the ink inner barrel in a sleeved mode. According to the ink filling device, ink can be rapidly and conveniently filled into the ink inne