The invention relates to the field of washing powder equipment, in particular to a bottled laundry detergent cover sealing device. The bottled laundry detergent cover sealing device comprises a bottle unloading machine, and a bottle washing machine is connected to the bottle unloading machine and connected with an empty bottle checking table; a filling sealing machine is connected to the empty bottle checking table, and liquid checking devices are connected to the filling sealing machine; a sterilization cooling pipe is connected to the liquid checking devices, and a boxing machine is connected to the sterilization cooling pipe; a box sealing machine is connected to the boxing machine, and bottles needed to be used are subject to bottle cap unloading treatment through the bottle unloading machine; then, the bottles are washed through the bottle washing machine, and purity of a laundry detergent is ensured; the quality of empty bottles can be further ensured through the empty bottle checking table, then the empty bottles are filled with the raw materials and sealed, finally, checking is carried out, and it is ensured that the sealed laundry detergent is enough in weight; the bottles enter the boxing machine through the sterilization cooling pipe to be boxed, and finally box sealing is carried out; and the laundry detergent boxing working procedures from head to tail are connected and are integrated on the device, use is convenient, and a large number of workloads are saved.