A stretchable display module and a control method and a detection method thereof are provided. The stretchable display module includes a display panel, a magnetic field generator and a feedback regulation unit. The display panel includes a stretchable closed loop circuit. The magnetic field generator generates a normal phase magnetic field. The feedback regulation unit acquires an induced electromotive force, generated by the stretchable closed loop circuit in the magnetic field, in real time in a stretching process of the stretchable display module, and regulates a stretch state of the stretchable display module according to a magnitude of the induced electromotive force.