The invention discloses a conveying device of a printed circuit board assembly. The conveying device comprises a lifting mechanism, a first conveying mechanism, a transferring mechanism, a second conveying mechanism, a push-out mechanism, a push-back mechanism, a loading frame and a plurality of loading plates, wherein the loading frame is correspondingly loaded with the loading plates, and the loading plates are provided with a plurality of accommodating grooves; the loading frame loaded with the empty loading plates is conveyed to the lifting mechanism through the first conveying mechanism,and then is driven to a set position through the lifting mechanism, one empty loading plate is pushed out by the push-out mechanism and then is driven by the second conveying mechanism to collect materials, the full-load loading plates are again sent back by the second conveying mechanism, and are pushed back into an original position in the loading frame through the push-back mechanism, then thelifting mechanism drives the loading frame to move one step, the process is repeated until all the loading plates in the loading frame are fully loaded, and then the loading plate are conveyed out bythe second conveying mechanism. According to the conveying device, the application range can be greatly expanded and the conveying efficiency can be greatly improved.