The invention relates to novel light-weight compression resistance foam concrete and a preparation method thereof. The preparation method of the novel foam concrete comprises the following steps: adding cement slurry into foam, stirring to form uniform flowing slurry, injecting the uniform flowing slurry into a mold, standing, forming and demolding to obtain a blank, naturally standing and maintaining the blank at the room temperature, thus obtaining the novel foam concrete; and cement slurry is prepared by mixing the following raw materials in parts by weight and appropriate amount of water:30 to 50 parts of cement, 20 to 40 parts of coal ash, and 15 to 30 parts of lime powder; and the foam is prepared in the following method: a foaming agent and water are mixed in a weight ratio of 1: (100 to 200) and then stirred for 10 to 15 min by using a high speed stirrer, thus obtaining the foam.