The invention discloses a three-dimensional printing self-heating porous gel beauty mask and a preparation method thereof. The preparation method comprises the steps that a porous mask stent solution is printed in a vacuum environment through a 3D printer according to the human facial geometric features, and a porous mask stent layer is formed; a mask solution is printed on the porous mask stent layer; a self-heating ingredient is printed, porous mask stent gel is printed, and then the three-dimensional printing self-heating porous gel beauty mask is obtained. According to the preparation method, the preparation technology steps are simple, short time is consumed, and an all-round beauty effect is achieved on skin through a beauty solution added in the mask. The mask can be closely attached to the skin, nutritional ingredients in the mask can be better absorbed by the skin in a heated state, and therefore a good beauty effect is achieved.