A test support apparatus includes a supporting mechanism supporting a product, a holding post pressed on the product, a positioning assembly, an operating member and a clamping member. The positioning assembly is attached to the supporting mechanism and the holding post. The positioning assembly includes a positioning member and a moving member. The moving member is attached to the holding post, and moveably relative to the positioning member to adjust a distance between the holding post and the supporting mechanism. The operating member is rotatably attached to the positioning member. The clamping member is rotatably attached to the operating member and rotatable relative to the operating member about a first axis. The clamping member engaged with the supporting mechanism, and the operating member is rotatable relative to the positioning member about a second axis to rotate the clamping member about the first axis to disengaged from the supporting mechanism.