A booth module for exhibition includes: a frame; a main body dowel; a bolt detachably coupled to the main body dowel; and a cap dowel detachably coupled to the bolt, wherein the main body dowel has: a body having a bolt insertion hole formed therein; a button of which a part is inserted and installed in the body through a button installation hole formed in the body; and a spring installed inside the body and pushing one end of the button, and wherein the cap dowel has: a body having a bolt insertion hole formed therein; a button of which a part is inserted and installed in the body through a button installation hole formed in the body; and a spring installed inside the body and pushing one end of the button, wherein the buttons are provided with bolt through holes communicating with the bolt insertion holes.