The invention provides a control system of an intelligent reminding device for incorrect sitting posture, and relates to the field of incorrect sitting postures. The control system is composed of a main control single-chip microcomputer, an OLED liquid crystal display module, a laser ranging module, a pressure monitoring module, a sound prompt module, a key control module and a power supply module. According to the invention, the system realizes multi-dimensional comprehensive monitoring, and is humanized in design. Different wrong sitting postures such as humpback sitting, prone sitting and inclined sitting are monitored in an up-and-down and left-and-right multi-dimensional mode, and reminding threshold values such as pressure and distance difference are customized by the user accordingto the actual situations such as different heights and weights of students and different sizes of chairs. According to the set parameters, the device intelligently judges the sitting posture of the student, and once the sitting posture is incorrect, correction is reminded in time. The device also has the functions of sedentariness duration reminding and winter heating. The device is good in expansibility, a WIFI module can be added in the later period, and parents can check the sitting posture condition of the child on a mobile phone.