A data sensing device and a data sensing method are provided. The data sensing device includes a current adjuster and a sensing amplifier. The current adjuster corresponds to a memory string of a memory array, generates a shift current according to an amount of a plurality of input signals of the memory string, and generates an adjusted read-out current by adjusting a read-out current of the memory string according to the shift current. The sensing amplifier receives the adjusted read-out current and a plurality of reference currents, and generates a read-out data by comparing the adjusted read-out current and the plurality of reference currents.