  Witnessing entanglement is crucial in quantum information processing. With
properly preparing ancillary states, it has been shown previously that genuine
entanglement can be witnessed without trusting measurement devices. In this
work, we generalize the scenario and show that generic multipartite
entanglement structures, including entanglement of subsystems and entanglement
depth, can be witnessed via measurement-device-independent means. As the
original measurement-device-independent entanglement witness scheme exploits
only one out of four Bell measurement outcomes for each party, a direct
generalization to multipartite quantum states will inevitably cause
inefficiency in entanglement detection after taking account of statistical
fluctuations. To resolve this problem, we also present a way to utilize all the
measurement outcomes. The scheme is efficient for multipartite entanglement
detection and can be realized with state-of-the-art technologies.
