An oil loading apparatus which is connected to a supply pipe and loads oil in a storage tank, the oil loading apparatus comprising: a loading pipe which is connected to the supply pipe and disposed in a vertical direction in the inside of the storage tank; and a pressure drop module which is connected to a lower end of the loading pipe and induces a pressure drop of the oil discharged from the loading pipe, wherein the pressure drop module comprises: a pressure drop pipe which is connected to the lower end of the loading pipe; multi-hole orifices (26, 27, 29) which are disposed in a transverse direction in an inside of the pressure drop pipe; wherein the said orifices (26, 27, 29) are shaped as plates; and a T-shaped branch pipe which includes a vertical pipe, one end of which is communication with the lower end of the pressure drop pipe and the other end of which is closed, and a horizontal pipe, which is in communication with the vertical pipe and which is disposed separately from the other end of the vertical pipe by a predetermined distance, while extending in the transverse direction from one sidewall of the vertical pipe, wherein the oil loading apparatus is provided such that the orifices (26, 27, 29) open and close the inside of the pressure drop pipe according to rotation of said orifices. a loading pipe which is connected to the supply pipe and disposed in a vertical direction in the inside of the storage tank; and a pressure drop module which is connected to a lower end of the loading pipe and induces a pressure drop of the oil discharged from the loading pipe, wherein the pressure drop module comprises: a pressure drop pipe which is connected to the lower end of the loading pipe; multi-hole orifices (26, 27, 29) which are disposed in a transverse direction in an inside of the pressure drop pipe; wherein the said orifices (26, 27, 29) are shaped as plates; and a T-shaped branch pipe which includes a vertical pipe, one end of which is communication with the lower end of the pressure drop pipe and the other end of which is closed, and a horizontal pipe, which is in communication with the vertical pipe and which is disposed separately from the other end of the vertical pipe by a predetermined distance, while extending in the transverse direction from one sidewall of the vertical pipe, wherein the oil loading apparatus is provided such that the orifices (26, 27, 29) open and close the inside of the pressure drop pipe according to rotation of said orifices. a pressure drop pipe which is connected to the lower end of the loading pipe; multi-hole orifices (26, 27, 29) which are disposed in a transverse direction in an inside of the pressure drop pipe; wherein the said orifices (26, 27, 29) are shaped as plates; and a T-shaped branch pipe which includes a vertical pipe, one end of which is communication with the lower end of the pressure drop pipe and the other end of which is closed, and a horizontal pipe, which is in communication with the vertical pipe and which is disposed separately from the other end of the vertical pipe by a predetermined distance, while extending in the transverse direction from one sidewall of the vertical pipe, wherein the oil loading apparatus is provided such that the orifices (26, 27, 29) open and close the inside of the pressure drop pipe according to rotation of said orifices.