The invention provides a control method, device and system for an LRA motor driving chip. The control method is applied to a motor control system and comprises the following steps: firstly acquiring arising edge or a falling edge in a hardware triggering pulse, and controlling a state machine to enter a comparison state from an idle state when arriving at the preset rising edge or falling edge; determining hardware triggering pins with priorities meeting the preset conditions as target pins according to the priorities of the hardware triggering pins; and finally, while arriving at the presettime, controlling the motor driving chip to trigger pulse play waveforms according to the hardware of the target pins. Therefore, according to the method for controlling an LRA motor to vibrate according to preset play waveforms, a virtual key has a touch feel of a physical key, and electronic equipment has diversified functions, so that the user experience is improved.