Heat sink for high-power LED park lamp

The utility model relates to a heat sink for a high-power LED park lamp. The heat sink comprises a lamp holder plate (1), a cooling liquid tank body (1.1) on the back side of the lamp holder plate (1), a lamp cap sealing head (2) and a lamp tail sealing head (3); a mounting platform for an LED chip module is arranged on the front side of the lamp holder plate (1), and the cooling liquid tank body (1.1) is a hollow flat tubular tank body and is integrally designed and developed on the back of the lamp holder plate (1); the lamp cap sealing head (2) and the lamp tail sealing head (3) are installed at both ends of the cooling liquid tank body (1.1) through mounting screws (4); sealing rings are additionally arranged between the cooling liquid tank body (1.1) and the sealing heads at both ends of the cooling liquid tank body (1.1); a liquid filling hole (5) is formed on the lamp tail sealing head (3); the cooling liquid tank body (1.1) is filled with cooling liquid (1.3); and shorter radiating fins (1.2) are retained on the back of the cooling liquid tank body (1.1). The heat sink has better heat dissipating effect and better temperature equalizing effect, and is favorable for the normal implementation of overall light efficiency of the high-power LED park lamp.