An alpha type cyclone separator which belongs to the isolation technique comprises a straight bowl body, a conical bowl body, an ash exhausting pipe, a coping, a liquid inlet, and a liquid outlet. The utility model is of small conical angle and long conical body structure, and the angle between the axes of the liquid inlet and the horizontal direction is of alpha. The coping is a spiral lamina with an obliquity of alpha, and an air inlet and the straight bowl boy, as well as the coping are tangent according to the obliquity alpha of the coping. The alpha is from 5 DEG C to 25 DEG C, and a second class or a second and third circumfluent cyclone separator also can be connected in series. The separating efficiency of the alpha type cyclone separator is obviously superior to a traditional hydrocyclones, and the alpha type cyclone separator is of low pressure drop, small amplification effect, high separation definition, and obvious energy saving effect. The pressure drop is about 70 percent that of traditional hydrocyclones, therefore, the utility model can satisfy the separating demand of high concentration, widely distributed granularity of solid particles, highly required technical process, and great difficulty for classification. The cyclone separator can be widely popularized and applied in chemical engineering, petroleum, metallurgy, medicine, and environmental protection field.