Abstract: A multifunctional sofa includes a base seat, a back supporting frame and a cushion pad. The base seat includes a frame, a support cloth located inside the frame, and a plurality of resilient members connected between the frame and the support cloth. The back supporting frame is disposed at a side of the frame of the base seat. The cushion pad is disposed on the base seat. At a lifted-up posture, the multifunctional sofa serves as a chair. At a lay-down posture, the multifunctional sofa serves as a bed. When the cushion pad is removed, the multifunctional sofa serves as a trampoline on which the user may practice jumping exercise. In accordance with the user's requirement, the multifunctional sofa can be utilized as a chair for sitting, a bed for lying, or a trampoline for jumping so as to preserve more space for home activities.