A color regulation method for a colored light to automatically achieve maximum brightness thereof, including a formula calculation step and a color mixture control step, wherein the colored light includes m primary colors, in which m is an integer equal to or greater than 2, characterized in that the formula calculation step comprises: establishing a linear programming model according to a specified target color mixture ( K t) of the colored light, and brightness values and color coordinate values of each primary color of the colored light, and taking a maximum value of a brightness sum value ( L sum) of the brightness values of each primary color of the colored light as a target function to solve the linear programming model to obtain a respective brightness value for each primary color under the maximum value of the brightness sum value ( L sum), wherein the obtained respective brightness values for each primary color are referred to as brightness formula values for each primary color, and the brightness sum value ( L sum) is the sum of the respective brightness values for each primary color; the color coordinate values of the target color mixture ( K t) of the colored light are denoted as (x t, y t), the respective brightness values of the m primary colors of the colored light are respectively denoted as L' 1, L' 2,..., L' m, and the color coordinate values of the m primary colors of the colored light are respectively denoted as ( x 1, y 1), ( x 2, y 2),..., and ( x m, y m); the linear programming model is the following formula: the target function is max L sum = L ′ 1 + L ′ 2 +... + L ′ m s.t. { 0 ≤ L ′ 1 ≤ L 1 0 ≤ L ′ 2 ≤ L 2...... 0 ≤ L ′ m ≤ L m x t y t L ′ 1 + L ′ 2 + ⋯ + L ′ m = x 1 y 1 L ′ 1 + x 2 y 2 L ′ 2 + ⋯ + x m y m L ′ m 1 − x t − y t y t L ′ 1 + L ′ 2 + ⋯ + L ′ m = 1 − x 1 − y 1 y 1 L ′ 1 + 1 − x 2 − y 2 y 2 L ′ 2 + ⋯ + 1 − x m − y m y m L ′ m where L 1, L 2,..., L m are respectively maximum brightness values of the m primary colors of the colored light, and s.t. represents a constraint condition of the linear programming model, the color mixture control step comprises: converting the brightness formula values for each primary color into a control signal, and controlling a color mixture of the colored light according to the control signal. establishing a linear programming model according to a specified target color mixture ( K t) of the colored light, and brightness values and color coordinate values of each primary color of the colored light, and taking a maximum value of a brightness sum value ( L sum) of the brightness values of each primary color of the colored light as a target function to solve the linear programming model to obtain a respective brightness value for each primary color under the maximum value of the brightness sum value ( L sum), wherein the obtained respective brightness values for each primary color are referred to as brightness formula values for each primary color, and the brightness sum value ( L sum) is the sum of the respective brightness values for each primary color; the color coordinate values of the target color mixture ( K t) of the colored light are denoted as (x t, y t), the respective brightness values of the m primary colors of the colored light are respectively denoted as L' 1, L' 2,..., L' m, and the color coordinate values of the m primary colors of the colored light are respectively denoted as ( x 1, y 1), ( x 2, y 2),..., and ( x m, y m); the linear programming model is the following formula: the target function is max L sum = L ′ 1 + L ′ 2 +... + L ′ m s.t. { 0 ≤ L ′ 1 ≤ L 1 0 ≤ L ′ 2 ≤ L 2...... 0 ≤ L ′ m ≤ L m x t y t L ′ 1 + L ′ 2 + ⋯ + L ′ m = x 1 y 1 L ′ 1 + x 2 y 2 L ′ 2 + ⋯ + x m y m L ′ m 1 − x t − y t y t L ′ 1 + L ′ 2 + ⋯ + L ′ m = 1 − x 1 − y 1 y 1 L ′ 1 + 1 − x 2 − y 2 y 2 L ′ 2 + ⋯ + 1 − x m − y m y m L ′ m where L 1, L 2,..., L m are respectively maximum brightness values of the m primary colors of the colored light, and s.t. represents a constraint condition of the linear programming model, the color mixture control step comprises: converting the brightness formula values for each primary color into a control signal, and controlling a color mixture of the colored light according to the control signal.