The utility model relates to a flexible microwavable heat pack. At present, most physiotherapy products for treating cervical diseases are electronic physiotherapy products, all of which have the defects of poor curative effects and being easily influenced by such condition factors as time, site, or the like. The utility model consists of a rectangle pack and a plastic spine. The two ends of the rectangle pack are provided with pull-tabs, the interior of the rectangle pack is filled with composite materials, the plastic spine is arranged at a horizontal middle neutral axis part inside the rectangle pack, the two ends of the surface of the rectangle pack are provided with flanges, and the interior of the flange is filled with composite clay; the two sides of the surface of the rectangle pack are provided with a plurality of convex blocks, and the interior of the convex block is filled with composite clay; and the plastic spine is composed by the connection of a plurality of spine joints imitating the shape of a human spine. When in use, the rectangle pack is folded up and down, and placed in a cervical vertebra part of a human body for heat pack (or cold pack); moreover, the pull-tabs may also be pulled for massage. The flexible microwavable heat pack integrates the functions of health care, heat pack or cold pack and massage, s simple to operate, is convenient to use, has wide application scope, and is beneficial for generalizing.