A hybrid green-energy street light apparatus includes a bus cable, a load unit, a first storage unit, a second storage unit and a green-energy generator. The load unit, the first battery body and the green-energy generator connect the bus cable. The first storage unit includes a first controller and a first battery body having a first voltage. The first controller keeps a terminal voltage of the first battery body at a second voltage greater than the first voltage. The second storage unit includes a second battery body, a second controller and a first switch. The second battery body connects the bus cable through the first switch. When the terminal voltage of the first battery body drops to the second voltage, the second controller closes the first switch to couple the second battery body and the bus cable. The green-energy generator charges the first storage unit and the second storage unit.