The utility model discloses a sealing filler device, cap and filler barrel are pressed including packing, wherein, pack and press cap both ends intercommunication unequal first portion of internal diameter and second portion, the internal diameter of first portion is greater than the internal diameter of second portion, be provided with the internal thread on the first portion, be provided with onfiller barrel's the first end with inner thread meshed's external screw thread, furthermore, the tip of first portion is followed the axial of pressing the cap of packing is provided with the screw hole, the device still includes nut and bolt, the nut sets up on filler barrel's the outer wall, just the axis of nut with filler barrel's axis is parallel, the bolt be configured as can threaded connection the mode pass the nut with the screw hole. The utility model provides a sealing filler device packs and presses cap and filler barrel firm in connection, and the vibrations of plunger pump can not make the pressure cap that packs take place not hard uply with filler barrel.