Reflow furnace with separated and matched primary and secondary tools and reflow soldering method

The invention provides a reflow oven with separated and matched son and mother tools and a reflow soldering method. The reflow oven comprises a front-end inlet module, a rear-end outlet module and a reflow oven cavity arranged between the front-end inlet module and the rear-end outlet module, and a mother tool conveying channel is formed below the reflow oven cavity; when the matched son and mother tools reach the front end inlet module, the matched son and mother tools are separated, the son tools enter the reflow oven cavity to conduct reflow soldering on the product, and the mother tools descend to the bottom of the front end inlet module from the top of the front end inlet module and enter the mother tool conveying channel; when the mother tool reaches the bottom of the rear end outlet module, the mother tool ascends to the top of the rear end outlet module from the bottom of the rear end outlet module and is matched with the child tool which is conveyed out of the reflow oven cavity and reaches the rear