The invention relates to a dummy which comprises a head, an upper half body, a lower half body, a left big arm, a left small arm, a left hand, a right big arm, a right small arm, a right hand, a left thigh, a left shank, a left foot, a right thigh, a right shank and a right foot. An upper locking rotary knob set is arranged in the upper half body. A lower locking rotary knob set is arranged in the lower half body. The dummy has the advantages that the structural state of the dummy can be adjusted through the upper locking rotary knob set and the lower locking rotary knob set, the dummy can be alternately used as a decoration product and a puppet product, and meanwhile the dummy is convenient to process and assemble. The invention further discloses an assembling method of the dummy.