The invention belongs to the technical field of office supplies, and particularly provides a support of a mobile terminal. The support comprises a base. A round groove and a sliding groove are formedin the base, and a spiral plate controlled by a rotary knob is arranged in the round groove. A sliding support is arranged in the sliding groove, and a telescopic frame is arranged in the sliding support. A fixing frame is arranged on the base. The fixing frame is connected with the sliding support through a shear fork mechanism. A supporting plate is hinged to the base. The upper side of the supporting plate is connected with a containing plate through connecting columns, and a heat dissipation water pipe is arranged between the supporting plate and the containing plate. A water bag is arranged among the supporting plate, the base and the sliding support. The rotary knob rotates to drive the spiral plate to rotate, the sliding support engaged with the spiral plate is pushed to move, the sliding support is connected with the fixing frame through the shear fork mechanism in the moving process, and the moving stability is improved; and the angle of the supporting plate is changed by moving the sliding support inwards, and the support is simple and rapid.