Abstract: A double-sealant tube structure for a caulking gun includes a container (10), a first feeder (20), a second feeder (30), and a pushing member (40). The container has an interior provided with a separation plate (12). The pushing member is provided with two first thrust portions (42) corresponding to the first feeder and a second thrust portion (41) corresponding to the second feeder. The pushing member is further provided with two cutting blades (43) each intersecting the separation plate of the container. Thus, when the pushing member pushes the first feeder and the second feeder, the separation plate is cut by the cutting blades to allow the pushing member to move forward.