Water tower fire truck

The utility model belongs to the technical field of fire fighting truck design, and particularly provides a water tower fire fighting truck which comprises a control box, an emergency power unit and a hydraulic driving device. An oil path of the hydraulic driving device is respectively connected with a cantilever crane and a supporting leg; the emergency power unit comprises a standby power supply, a direct-current motor and an emergency oil pump; the direct-current motor is connected with the emergency oil pump; the direct-current motor is connected with the standby power supply through the emergency switch; the emergency oil pump is connected to the hydraulic driving device through an oil path and an electromagnetic valve; and the electromagnetic valve and the hydraulic driving device are respectively connected with the control box. When a power system of a main vehicle breaks down, an emergency switch is pressed down, an emergency oil pump starts to work, an oil way is connected, downward bending and rotat