Abstract: A urea solution pump structure may include a housing portion connected to an external connector and covering an upper portion of the pump structure, a motor portion disposed at a lower portion of the housing portion and including a rotor and a stator, a case portion receiving the motor portion therein, and a pump portion disposed at a lower portion of the case portion and fluid-isolated from the motor portion, wherein the pump portion may be formed with an inlet and an outlet for a fluid, wherein a hollow cover may be provided at a lower portion of the case portion for separating the pump portion and the motor portion, and an oil seal unit may be mounted at a lower portion of the hollow cover for sealing a rotating shaft of the rotor which penetrates through the hollow cover.