A three-channel closed coal bed gas well gas-lift system is applied to the technical field of coal bed gas exploitation. The utility model is characterized in that: the bottom and the top of the down-hole oil pipe are respectively provided with a down-hole sealing pipe nipple and a well head sealing pipe nipple; a hollow sucker rod is fixed in the oil pipe; and the upper end of the hollow sucker rod is connected with a generated water channel. An concentric gas-lift valve is fixed at the middle part of the hollow sucker rod. An annular space formed by the oil pipe and the hollow sucker rod is an injected gas channel which is connected with an electric control regulating valve and an air compressor. The signal of the down-hole pressure gauge is transmitted to a ground control system through a cable. The control system is connected with the electric control regulating valve through a lead. The three-channel closed coal bed gas well gas-lift system has the following effects: realization of intelligent exploitation with coal bed gas field cluster well, high-inclination well or multi-branch well group; no effect from gas and solid particles, capability for effectively preventing the mixing among the power gas, the generated water and the generated gas; strong safety performance; and settlement for the effect of power gas to the coal bed.