The utility model discloses an intelligent watch and PCB mainboard thereof. The PCB mainboard comprises: a mainboard main body; a plurality of functional circuit areas arranged on the mainboard main body, electronic components and / or
metal wiring being arranged in the functional circuit areas; a plurality of
signal isolation areas arranged on the mainboard main body, a plurality of first through holes penetrating through the mainboard main body being arranged in the
signal isolation areas; and the plurality of first through holes are arranged in sequence at the edges of the
signal isolation areas, so as to reduce
signal interference and loss between different functional circuit areas.