A pet grooming machine and a method for pet hair grooming is provided. The pet grooming machine includes a blower having a blower air-inlet, a motor unit, a blower air-outlet, and an air channel, a tank unit having a tank, a tank air-inlet, a filter, and an air-outlet. The blower and tank unit can be in either separated configuration or combined configuration. In separated configuration, the blower is separated from the tank unit and can be independently used for blowing. In combined configuration, the blower air-inlet and the tank unit are detachably combined and sealed. In combined configuration, the negative pressure generated by airflow driven by the blower is transmitted to the tank air-inlet through the tank and the filter. The blower is a portable blower, which can be held with one hand by the user for prolonged blowing on the pet without need for an external flexible hose.