Information input device

The utility model discloses an information input device which comprises an input portion and a tactile feedback portion arranged on the input portion. The input portion comprises a top electrode, a bottom electrode and a microprocessor, a preset distance is reserved between the top electrode and the bottom electrode, and the microprocessor is respectively electrically connected with the top electrode and the bottom electrode and used for realizing input action when the top electrode contacts with the bottom electrode. The tactile feedback portion comprises a first substrate layer, a second substrate layer, an upper conducting layer, a lower conducting layer, electrorheological fluid, a power supply and a switching element, the first substrate layer is arranged on the top electrode, a preset distance is reserved between the first substrate layer and the second substrate layer, the upper conducting layer is coated on the lower surface of the second substrate layer, the lower conducting layer is coated on the up