The invention discloses an innovative structure so that an LED road lamp with the feature of light distribution is realized. The LED road lamp is composed of two parts including a light source cavity assembly and a power cavity assembly as well as their attached connecting wires, sealing parts and fasteners. The light source cavity assembly comprises a heat radiator, light source assemblies, a PC cover, a back board and the like. The light source cavity assembly comprises a power cavity, a power supply, a hoop and the like. The light source cavity assembly internally comprises the heat radiator, in which two V-shaped light source assemblies are fixedly arranged. A PC cover is arranged on the light source assemblies and designed with an arc protrusion. The back side of the heat radiator is provided with the back board. The back board is connected with the heat radiator through rivets. The light source cavity assembly is placed at the specific position in the V shape. The combination of the PC cover with the arc protrusion, the back board and the heat radiator can realize the design of light distribution which is specific to the road lamp. The design of the above structure does not need high-precision optical devices such as complicated reflectors, lens and others, thereby increasing the production efficiency and the yield rate. The technological requirement is lowered. Production and manufacture cost is reduced. Heat radiation efficiency of the road lamp is improved and service lifetime of the road lamp is prolonged.