A multi-function safety device for a pneumatic fender that is configured to be installed at a berth of a pier to serve as a buffer in case of collision between a ship and the berth, the multi-function safety device for the pneumatic fender comprising: a first valve body that is configured to be provided at an end of the pneumatic fender and controls incoming and outgoing of air; a first valve that is installed so as to be detachable from the first valve body and is configured to open and close communication of air inside and outside the pneumatic fender by communicating an inside of the pneumatic fender with a first accommodating space provided in a first body included in the first valve body; a second valve body that is installed in the first accommodating space and is provided with a second accommodating space so that the air inside the pneumatic fender is accommodated through a second valve; the second valve that is disposed on a lower portion of the second valve body to prevent the air of a test pressure provided for a pneumatic test of a safety valve from flowing into the pneumatic fender; the safety valve that is installed in the second accommodating space and is provided with an outlet for discharging the air to an outside through a through passage and a connection passage of the first valve body and a through passage of the second valve body when an internal pressure of the pneumatic fender is greater than or equal to a preset pressure; a pneumatic test part that is disposed in the safety valve and is provided to perform a pneumatic operation test of the safety valve; and a manual test part that is disposed on a protective cover formed on an upper portion of the safety valve and is provided for a manual operation test of the safety valve, wherein the first valve, the second valve, the safety valve, the pneumatic test part, and the manual test part are provided in the first valve body. a first valve body that is configured to be provided at an end of the pneumatic fender and controls incoming and outgoing of air; a first valve that is installed so as to be detachable from the first valve body and is configured to open and close communication of air inside and outside the pneumatic fender by communicating an inside of the pneumatic fender with a first accommodating space provided in a first body included in the first valve body; a second valve body that is installed in the first accommodating space and is provided with a second accommodating space so that the air inside the pneumatic fender is accommodated through a second valve; the second valve that is disposed on a lower portion of the second valve body to prevent the air of a test pressure provided for a pneumatic test of a safety valve from flowing into the pneumatic fender; the safety valve that is installed in the second accommodating space and is provided with an outlet for discharging the air to an outside through a through passage and a connection passage of the first valve body and a through passage of the second valve body when an internal pressure of the pneumatic fender is greater than or equal to a preset pressure; a pneumatic test part that is disposed in the safety valve and is provided to perform a pneumatic operation test of the safety valve; and a manual test part that is disposed on a protective cover formed on an upper portion of the safety valve and is provided for a manual operation test of the safety valve, wherein the first valve, the second valve, the safety valve, the pneumatic test part, and the manual test part are provided in the first valve body.