A disassembly tool kit for replacing vehicular decorative plates comprises a handle including a handheld end and a handle-side engagement end far away from the handheld end, and at least one replaceable tool each including a tool-side engagement end corresponding to the handle-side engagement end and a working end far away from the tool-side engagement end. The handle-side engagement end includes a first fixing element and a first locking element. The working end includes a decorative-plate disassembly element. The tool-side engagement end includes a second fixing element corresponding to the first fixing element for a press-fit engagement and a second locking element corresponding to the first locking element for a locking effect. The user may select an appropriate replaceable tool according to the decorative plate or strip, which is to be disassembled, and install the replaceable tool in the handle.