A connection apparatus, a manufacturing method of the connection apparatus, and a thermal management component are provided. The connection apparatus includes two or more plate bodies; the adjacent plate bodies are fixed and connected in a sealed manner; the connection apparatus is provided with a channel; at least one channel part is arranged in at least one of the adjacent plate bodies; the adjacent plate bodies define a channel at the channel part. One of the side walls of at least one plate body is provided with a mounting portion and/or a connecting portion along the axial direction or radial direction of the connection apparatus; the mounting portion is internally provided with a mounting hole for communication with the channel; the the connecting portion is provided with a connecting hole.
