A cup assembly with circuit actuating capability comprises: a cup body having a bottom recess that is defined by a recess-defining wall and that has an open end, the recess-defining wall being provided with a threaded structure; a module support having a base part that covers the open end of the bottom recess, and a threaded confining part that is connected to the base part, that is received in the bottom recess, that defines an accommodating space, and that engages threadedly with the threaded structure; and a signal producing module mounted on the base part, received in the accommodating space, and including a signal producing member and a first switch that is coupled to the signal producing member and that is operable to enable and disable the signal producing member.