A device for automatically inducting and tightly sucking micro-channel side boards comprises a tightly-sucking mechanism, a lifting mechanism and a pushing mechanism. The tightly-sucking mechanism is fixed on a supporting base and comprises a press board, a square pipe and a sucker, the square pipe is fixed on the press board, and the sucker is fixed inside the square pipe; the lifting mechanism comprises a supporting frame, a first motor and a first transmission rod which is connected with the first motor, the first motor is fixed on the supporting frame, and the other end of the first transmission rod is fixedly connected with the supporting base; the pushing mechanism comprises a locating block, a second transmission rod and a transmission device which is connected with one end of the second transmission rod, the locating block is fixedly arranged on a base, and the second transmission rod clamps and penetrates through the locating block. Due to the arrangement of the sucker on the tightly-sucking mechanism, the lifting mechanism and the pushing mechanism are controlled to operate and convey the side boards to an appointed portion to be machined and assembled through the fact whether the sucker sucks the side boards or not, and the situation that machining and assembling are conducted under the situation that no side board exists can be avoided. The device for automatically inducting and tightly sucking the micro-channel side boards is simple in structure, reasonable in design and high in degree of automation.