A liquid filling device is provided, including: a base, a connecting assembly, a pressure gauge, at least one filling assembly and a negative pressure generator. The base includes a channel, and the channel extends through the base and includes at least one liquid inlet, a first gas port, a second gas port, an assembling opening and a measuring port. The negative pressure generator includes a tube body and a venturi structure, and the tube body is disposed through the base and includes a penetrating portion disposed through the channel. The penetrating portion has at least one through hole, and the venturi structure is received within the penetrating portion and communicated with the channel. When a gas is passed through the venturi structure, a negative pressure is generated to extract a gas in the container to be filled.

A liquid filling device is provided, including: a base, a connecting assembly, a pressure gauge, at least one filling assembly and a negative pressure generator. The base includes a channel, and the channel extends through the base and includes at least one liquid inlet, a first gas port, a second gas port, an assembling opening and a measuring port. The negative pressure generator includes a tube body and a venturi structure, and the tube body is disposed through the base and includes a penetrating portion disposed through the channel. The penetrating portion has at least one through hole, and the venturi structure is received within the penetrating portion and communicated with the channel. When a gas is passed through the venturi structure, a negative pressure is generated to extract a gas in the container to be filled.