The invention discloses a softrock-like material and a preparation method thereof. The softrock-like material is composed of filler, aggregate, cementitious materials, additives and water in certain proportion. The preparation method comprises the steps of: 1. weighing the raw materials; 2. loading and stirring: adding water in a stirrer, causing the barrel wall of the stirrer to be smooth, then starting the stirrer, and adding the filler, aggregate, cementitious materials and additives sequentially followed by continuous stirring; 3. adding water and stirring: adding water during stirring, setting the speed of the stirrer at high and continuing stirring; 4. shaking and forming: discharging the materials, pouring the slurry into a pre-manufactured die, vibrating with a vibrating rod, causing the slurry to be even, removing foam and finally scraping the surface of the model to be level; and 5. maintaining in a baking house: sending the manufactured die into the baking house for maintenance. The material has the characteristics of low volume-weight, low compression strength and elastic modulus, stable property, easy processing, low cost and no toxicity, and is suitable for geomechanics research on softrock exploration and stability of softrock underground gas storage cavity.