An anchorage device, comprising a connection mechanism to be disposed on a seat base equipment of a child safety seat system, and an engagement mechanism, capable of being engaged to an anchorage equipment of a car seat system, the anchorage device further comprising a cushion mechanism, disposed between the connection mechanism and the engagement mechanism, such that the cushion mechanism is driven to absorb impact energy once generated through an occurrence of a relative movement between the connection mechanism and the engagement mechanism, characterized in that the connection mechanism includes a sleeve, disposed on the seat base equipment, the engagement mechanism includes a connection rod, the connection rod and the sleeve passing through each other, and a snap lock, connected to the connection rod and capable of being engaged to the anchorage equipment, and the cushion mechanism includes a cushion body, disposed between the sleeve and the connection rod, such that the cushion body is driven by the sleeve and the connection rod to be structurally deformed once the relative movement occurs, wherein the connection rod and the sleeve slidably pass through each other, and wherein the cushion body includes a first circumference wall and a second circumference wall, formed on the sleeve and stacked on each other, and an energy absorption pin, passing through the first circumference wall and the second circumference wall and connected to the connection rod, the first circumference wall has a first through slot, for the energy absorption pin to pass therethrough, the second circumference wall has a second through slot, partially overlapping the first through slot and provided for the energy absorption pin to slidably pass therethrough, an inner dimension of the first through slot is equal to an outer dimension of the energy absorption pin, the second through slot extends along a sliding direction between the connection rod and the sleeve, and a slot dimension of the second through slot in the sliding direction is larger than a slot dimension of the first through slot in the sliding direction, such that the energy absorption pin hits a slot edge of the first through slot and slides into a portion of the second through slot not overlapping the first through slot, so as to render the slot edge of the first through slot structurally destruct once the relative movement occurs, wherein the cushion body further includes a third circumference wall, formed on the sleeve, the third circumference wall and the second circumference wall overlapping each other, the third circumference wall has a third through slot, partially overlapping the first through slot and the second through slot and provided for the energy absorption pin to slidably pass therethrough, the third through slot extends along the sliding direction, and a slot dimension of the third through slot in the sliding direction is larger than the slot dimension of the second through slot in the sliding direction, such that the energy absorption pin hits a slot edge of the second through slot and slides into a portion of the third through slot not overlapping the second through slot, so as to render the slot edge of the second through slot structurally destruct once the relative movement occurs.