The invention discloses a hydraulic control system for a folding arm-type overhead working truck. The hydraulic control system for the folding arm-type overhead working truck comprises a pump group, an upper truck control multi-way valve, a lower truck control multi-way valve and a bypass throttle valve group; the lower truck control multi-way valve comprises a two-position three-way valve, a liquid-controlled overflow valve and a supporting leg control valve; a pilot oil way of the liquid-controlled overflow valve is communicated with the upper truck control multi-way valve; the supporting leg control valve distributes hydraulic power which is provided by the pump group to different lower truck actuating components. The hydraulic control system for the folding arm-type overhead working truck has the beneficial effects that: 1, the overall system is divided into two parts, i.e., an upper truck control system and a lower truck control system through a two-position three-way reversing valve, so that the lower truck control system and the upper truck control system realize an interlocking function, when an upper truck works, a lower truck cannot work, and when the lower truck works, the upper truck cannot work either; 2, a bypass throttle valve is arranged at each of a turntable and a working platform by utilizing a bypass throttling control mode, so that a worker can control the speed of an upper truck system conveniently when the turntable and the working platform operate, and the control cost of the system is reduced.