Provided is a jig for a compression test in a heating furnace capable of variously changing boundary conditions such as a both-end hinge, a both-end fixing, or one-end hinge and one-end fixing through simple attachment and detachment of a holder. Therefore, it is possible to easily implement hinge and fixing conditions of a test sample installed in a heating furnace using one jig, remarkably reducing time and cost consumed to install the test sample.