A multifunctional filler tool is a combination of three different tools, the trowel covers and slides along the scraper between the idle and active positions, namely, the trowel and the scraper do not increase the width of the entire multifunctional filler tool so as to limit the size of the multifunctional filler tool. When in the active position, the trowel fully covers the scraper, while the scraper does not interfere with the operation of the trowel. When in the idle position, the trowel moves away from the scraper while still keeping abutting against the scraper, namely, the trowel won't protrude in the upward direction to stick out of the scraper; therefore, the trowel does not interfere with the gripping of the handle.