The invention relates to a liquid storage device, in particular to a liquid storage device with a storage volume display function. The liquid storage device with the storage volume display function comprises a shell (1), wherein a folding bag (2) and a rotary shaft (3) are arranged in the shell (1); the rotary shaft (3) is fixed to the shell (1), and one end of the rotary shaft (3) is exposed out of the shell (1), wherein a pointer (4) is fixed to the end; one end of the folding bag (2) is provided with a bag opening (201) exposed out of the shell (1), and the other end of the folding bag (2) is fixed to the rotary shaft (3) so that the folding bag (2) can drive the rotary shaft (3) to rotate when stretching out or drawing back. The storage volume of liquid in the folding bag can be conveniently observed through the indication position of the pointer outside the shell, and the liquid storage device is quite convenient to use. The liquid storage device with the storage volume display function is ingenious in structure, easy to manufacture, durable and particularly suitable for being used for traveling, army marching and the like.