The invention relates to the technical field of automobile production, and discloses an automobile engine compartment welding production line, which comprises a follow fixture system, a fixture switching area, a welding area, a workpiece feeding area and a workpiece storage and conveying area, wherein the follow fixture system comprises a fixture body, a sliding base and a rail device, the sliding base is used for detachably fixing the fixture body, and slides on the rail device, the rail device is used for respectively communicating every two of the fixture switching area, the welding area and the workpiece feeding area, the welding area comprises at least one group of welding robots and at least one group of workpiece grabbing robots, and the workpiece storage and conveying area is arranged at one side adjacent to the welding area. Compared with the prior art, the automobile engine compartment welding production line has the advantages that the requirement that workpiece feeding and welding need to be performed according to time sequence is avoided, and the production pace is improved; in addition, the fixture switching area which is matched with the follow fixture system is additionally arranged, and a fixture can be conveniently replaced, so as to be suitable for the quick switching of different vehicle models.