LED substrate structure

The utility model discloses an LED substrate structure. The LED substrate structure comprises a metal substrate, wherein grooves for mounting LED chips are arranged on the metal substrate, and each groove has inner walls which form an inverted frustum cone shape and are provided with a reflection layer, so that lights can be well focused and reflected and the utilization rate of the lights is improved; phosphor power can be arranged by just filling the grooves, thereby preventing the phosphor power from covering a large area of the metal substrate, saving the phosphor power and greatly reducing the cost; a silver layer which can reflect the lights is electroplated on the bottom of each groove, thereby improving the lighting efficiency; and the LED chips are mounted on the metal substrate in an upside-down manner, so that heat generated by the lighting of the LED chips can be directly dissipated by the metal substrate, and the heat dissipation effect of the LEDs is significantly improved.