The invention discloses a self-service hearing test and hearing assistant system. An 8051 type core processor is connected with a programmable amplifier by an I2C interface; the programmable amplifier is connected with an earphone through a voice frequency multichannel transmission circuit, and generates an accurate test sound through a universal asynchronous receiver/transmitter (UART) and a programmable calculator array (PCA) in a central processing unit (CPU); the CPU is connected with an LED display lamp, and the running state of the system is represented by different flickers of the LED display lamp; the CPU is connected with an LCD display screen, and an operation prompt message of a user is displayed; and the CPU is connected with three control keys which can input information and used for inputting the information. The system can analyze a hearing test result accurately to determine whether hearing loss of the user can be classified into some kind of typical hearing loss or not, then informs the user of the type of the hearing loss, and guides the user to choose a hearing-aid which is designed for the typical hearing loss; and in addition, the system can perform the hearing test in a complex sound environment, and also can fit the hearing-aid for the user with the untypical hearing loss.