The invention provides a device for measuring volume of gram weights, comprising a mas comparator (1), an automatic barycenter return balance device (4) suspended below the mass comparator (1), a liquid storage container (2) arranged below the balance device (4), a human-machine interface (5) electrically connected with the mass comparator (1), a multi-location assembling and disassembling device(6) and a liquid level lifting device (7) of the liquid storage container (2); the balance device (4) and the multi-location assembling and disassembling device (6) are provided with comb tooth-shaped bearing racks which are matched mutually; and the multi-location assembling and disassembling device (6) can carry out lifting and rotating motion under the driving of a driving mechanism. The device has the advantages of having short placing time, being operated simply, and being time-saving and labor-saving.