A CPM modulation digitization implementation method based on a table lookup method, comprising: step , establishing a phase table according to a mathematical expression of a CPM baseband modulated signal, wherein the phase table comprises an addressing address and a relative phase corresponding to the addressing address; step , generating a symbol pulse under control of a sampling clock, and delaying a current input symbol a n under control of the symbol pulse, to obtain (L+1) continuous symbols a n , a n -1 ,..., a n - L +1 , a n - L ; step , addressing the phase table established in the step using an addressing address [ h ( n ) , a n , a n -1 ,..., a n - L +1 , d ] formed by a modulation index h ( n ) corresponding to the current symbol a n , L continuous symbols a n , a n -1 ,..., a n - L +1 and a current sampling time d , to obtain a relative phase φ n ( t ); step , calculating an accumulative phase increment δ based on the symbol a n - L and a modulation index h ( n - L ) corresponding to the symbol a n - L according to an equation δ = πh (n- L ) a n-L ; step , adding the accumulative phase increment δ to an accumulative phase θ n-L -1 at the end of a period of a previous symbol a n - L -1 under control of the symbol pulse generated in the step , to obtain an accumulative phase θ n - L at the end of a period of the symbol a n - L ; step , adding the relative phase φ n ( t ) obtained in the step to the accumulative phase θ n - L obtained in the step , to obtain a phase φ n ( t ) of the CPM baseband modulated signal; and step , looking up a sine table and a cosine table using the phase φ n ( t ), to obtain orthogonal signals cos φ n ( t ) and sin φ n ( t ), to complete CPM baseband modulation. step , establishing a phase table according to a mathematical expression of a CPM baseband modulated signal, wherein the phase table comprises an addressing address and a relative phase corresponding to the addressing address; step , generating a symbol pulse under control of a sampling clock, and delaying a current input symbol a n under control of the symbol pulse, to obtain (L+1) continuous symbols a n , a n -1 ,..., a n - L +1 , a n - L ; step , addressing the phase table established in the step using an addressing address [ h ( n ) , a n , a n -1 ,..., a n - L +1 , d ] formed by a modulation index h ( n ) corresponding to the current symbol a n , L continuous symbols a n , a n -1 ,..., a n - L +1 and a current sampling time d , to obtain a relative phase φ n ( t ); step , calculating an accumulative phase increment δ based on the symbol a n - L and a modulation index h ( n - L ) corresponding to the symbol a n - L according to an equation δ = πh (n- L ) a n-L ; step , adding the accumulative phase increment δ to an accumulative phase θ n-L -1 at the end of a period of a previous symbol a n - L -1 under control of the symbol pulse generated in the step , to obtain an accumulative phase θ n - L at the end of a period of the symbol a n - L ; step , adding the relative phase φ n ( t ) obtained in the step to the accumulative phase θ n - L obtained in the step , to obtain a phase φ n ( t ) of the CPM baseband modulated signal; and step , looking up a sine table and a cosine table using the phase φ n ( t ), to obtain orthogonal signals cos φ n ( t ) and sin φ n ( t ), to complete CPM baseband modulation. <EOS>