Direct drinking water system, direct drinking water machine and control method

The invention belongs to the technical field of water treatment, and relates to a direct drinking water system, a direct drinking water machine and a control method. The direct drinking water system comprises a front filtering assembly, a rear filtering assembly, a hot tank unit, a water tank unit and a control unit. The water tank unit comprises a water tank body and a steam tank. The water tank body is arranged between the front filtering assembly and the rear filtering assembly. A steam inlet pipe of the steam tank is connected with a steam outlet of the hot tank unit, so that steam discharged by the hot tank unit can be introduced into an inner cavity of the steam tank to heat water in the water tank body. And a steam exhaust pipe communicated with the outside is arranged at the steam exhaust end of the steam tank. A temperature sensor part is arranged in the water tank body, and the control unit can control whether steam generated by the hot tank unit flows into the steam tank or not according to the wat