The invention discloses a multifunctional oral cavity trainer. According to the trainer, an umbrella-shaped body is connected to each of two heads of a handle, one of the umbrella-shaped bodies is composed of an upside-down umbrella cover and an umbrella handle, and the other umbrella-shaped body is composed of an upside-down umbrella cover, an umbrella handle and a sharp-tongue-shaped body extending from the inner umbrella circle center. Shapes of the umbrella covers and the sharp-tongue-shaped body, both made of elastic materials such as soft resin, of the umbrella-shaped bodies can be changed during operation of the umbrella covers and the sharp-tongue-shaped body, so that opening and closing of mouths, occlusion of upper and lower jaws and tongue turning in up, down, left and right directions are guided, swallowing reflex is stimulated, and lip closing capability, palate muscle groups, masticatory muscle groups, tongue muscle groups and pharynx muscle groups are trained; by the trainer, efficiency of existing swallowing rehabilitation training is improved through synchronous and coordinated exercises of muscle groups involved during ingesting, chewing and swallowing. The multifunctional oral cavity trainer has the advantages of simplicity in operation, safety in use and easiness in popularization for clinical medicine and family care.