The invention discloses an adjustment method based on an intelligent automatic speed adjustment system for a grinder. The adjustment method comprises the steps that initialization is performed to check whether each module works normally; vibration data of a medium impacting on the barrel wall of the grinder and technological data of operation of the grinder are acquired; whether swelling occurs is judged; if yes, a swelling treatment process is started; if not, a working condition is normal, so that a current rotation speed is not adjusted; when the vibration data of the barrel wall of the grinder is smaller than P1, and a slope is smaller than C1, the speed is adjusted to H1 hertz; when the slope is between C1 and C2, the speed is adjusted to H2 hertz; when the slope is greater than C2, the current rotation speed is maintained; when the vibration data of the barrel wall is greater than P2, and the slope is greater than C3, the speed is adjusted to H4 hertz; and when the slope is smaller than C3, the speed is adjusted to H3 hertz; after a speed adjustment command is emitted, the rotation speed is subjected to amplitude limiting treatment and then the rotation speed of the grinder is adjusted through the motor, so that intelligent automatic speed adjustment for the grinder is realized; the current power and oil pressure value of the grinder are cooperatively taken as reference, so that ore grinding efficiency can be improved to the greatest extent by the intelligent automatic speed adjustment system for the grinder; and economic benefit of an ore concentration plant is improved.