An electret capacitor microphone with one-piece vocal cavity component includes: a shell, a vibration element and a circuit board which is used to envelop the shell containing cavity and connect with the shell; the first vocal cavity is formed between the vibration element and the inner surface of the top of the shell; voice holes are connected with the first vocal cavity; wherein, one-piece vocal component that lies between the vibration element and circuit board is installed in the shell. The one-piece vocal cavity component is formed by an annular sidewall and a cavity board formed in one-piece on the annular sidewall. A through-hole is formed on the cavity board and inner concave at lower end of an annular sidewall. The second vocal cavity is formed between the annular sidewall and the cavity board. An external surface of the annular sidewall is coated with an insulating material layer.