The present invention relates to the technical field of ceramic-based composite materials, and particularly provides a method for preparing a continuous fiber-reinforced ceramic-based composite material through a hot pressing method. The preparation method comprises: preparing a continuous fiber preform, preparing an interface phase by using a thermal gradient chemical vapor deposition method, and preparing a ceramic matrix through a hot pressing method. According to the present invention, with the method, the disadvantages that the excessive etching of the matrix atom on the fiber causes the significantly reduced fiber strength and the decomposition of the interface layer causes the correspondingly reduced material strength during hot pressing cracking are improved, the fiber can maintain the original strength, and the matrix and the fiber can be closely bound so as to make the material achieve the high performance.