A linkage-type synchronous slide structure of relative slide assembly includes a slide member and a relative slide member slidably connected to the slide member. The relative slide member is formed with a slide guide section. The slide member is slidable relative to the relative slide member along the slide guide section. Two extensible/retractable assemblies with a variable length are respectively oppositely disposed on two sides of the slide guide section. Second ends of the extensible/retractable assemblies are respectively pivotally connected to corresponding sections of two sides of the slide member. First ends of the extensible/retractable assemblies are pivotally connected with each other and slidable along the slide guide section. A restriction mechanism is disposed between the extensible/retractable assemblies and the relative slide member to serve as a pivotal center of the extensible/retractable assemblies for restricting axial slide thereof and synchronizing the moves of two sides of the slide member.