A positioning fixture assembly includes a support member, a first clamping member, and a second clamping member. The support member includes a substantially cylindrical connecting portion and a supporting portion. A number of receiving grooves are defined in the connecting portion. The supporting portion includes a first surface. The first clamping member defines a first receiving slot and includes a first mounting surface and a first resisting surface. At least one projection projects from the bottom surface of the receiving slot. The connecting portion is received in the first and second receiving slots and is clamped by the first and second clamping members. The at least one projection is selectively received in the receiving grooves so that an angle is defined between the first surface and the first mounting surface.