The utility model belongs to the technical field of brushless direct current motor control, and discloses a brushless direct current motor self-adaptive speed regulation control system. The brushlessdirect current motor self-adaptive speed regulation control system is provided with a power supply management module, a target motor, a motor protection circuit module, a signal detection module, a main controller module and a motor driving module. The power supply management module comprises a + 3.3 V power supply module, a + 15V power supply module and a + 24V power supply module; the motor drive module comprises an MOSFET drive module and an MOSFET bridge circuit. The signal detection module comprises a Hall signal detection module and a current signal detection module. According to the utility model, motor protection circuits for overcurrent, locked-rotor prevention and the like are arranged, when a motor operation fault occurs, the fault indication lamp prompts the fault and stops operation to protect the system, and the system safety is improved; due to the adoption of segmented adaptive PID speed control, the rotating speed of the motor is more stable, and the load capacity andthe anti-interference capacity of the motor are improved at the same time.