Abstract: A multi-tube parallel heat spreader has at least three conduits disposed in parallel; a first connector fitted onto the first end of each conduit, with one side of the first connector configured with a first connecting plughole for the first end of each conduit to be inserted into, and a first connecting passage inside the first connector that is communicated to each first connecting plughole; a second connector fitted onto the second end of each conduit, with one side configured with a second connecting plughole for the second end of each conduit to be inserted into, and a second connecting passage inside the second connector that is communicated to each second connecting plughole; a working fluid contained in the vacuum interior of each conduit and the first and second connector; a heat conduction base abutting and combined with the conduits, including a heat conductive surface and a supporting surface.