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.