The invention relates to an LED lamp and an optical lens adopted by the LED lamp. The optical lens comprises a dome structure and a protruding structure. The dome structure is provided with an outer surface. The protruding structure is arranged on the outer surface of the dome structure in a protruding manner. The protruding structure is provided with a first optical face and a first optical side face connected with the first optical face. The first optical face is connected with the outer surface to form a first junction line. The first optical side face is inclined relative to the first junction line. The invention further provides the LED lamp. The LED lamp and the optical lens adopted by the LED lamp have the beneficial effect that the optical efficiency can be increased.