The utility model provides a multifunctional myopia prevention automatic controller. The rod end of a upright rod (2) is connected with an infrared probe (1) through an universal head (12), the infrared probe (1) is connected with a single chip microcomputer (8) which is arranged in a housing (9), and a loudspeaker (3) and/or an LED alarm lamp (11) and a battery (6) are connected with the single chip microcomputer (8). Meanwhile, the myopia prevention automatic controller further comprises a socket which is arranged on the housing (9). The socket is connected with a relay (10), the relay is connected with one electrode of an external power input plug (7), and the relay is further connected with the single chip microcomputer (8) at the same time. When the situation that the head of a user is lower than a set safe height is detected by the infrared probe (1), the single chip microcomputer that receives a signal commands a warning system to generate an alarm, and the desk lamp is extinguished; and when the sitting posture of the user gets right, the alarm is cancelled, and the desk lamp is on. According to the utility model, advantages, such as multiple warning methods, good warning effect, full-automatic monitoring etc., are realized, a significant myopia prevention effect is realized, and advantages of simple structure, low production cost, easy implementation, high practical value and high market value are realized.