The invention relates to a valsartan capsule and a preparation method thereof. The valsartan capsule comprises an active component valsartan and hydroxypropylcellulose serving as a disintegrating agent and an adhesive. The preparation method of the valsartan capsule comprises the following steps that 1), valsartan is sieved by a 200-mesh sieve; a filling agent and hydroxypropylcellulose are sieved by an 80-mesh sieve, and mixed uniformly; 2), an alcohol solution with the concentration of 5-60% is prepared, and accounts for 45-55% of the gross weight of valsartan, hydroxypropylcellulose, the filling agent, a cosolvent and a lubricant, and the cosolvent is dissolved by a half of the alcohol solution; 3), valsartan premix powder is placed in a wet method granulator, the alcohol solution of the cosolvent is added, and the left alcohol solution and purified water are added according to a granulation situation of a material, and stirred to form wet particles sieved by a 14-mesh sieve; 4), the wet particles are dried and granulated; and 5), the particles are uniformly mixed with the lubricant sieved by the 80-mesh sieve and filled to form the valsartan capsule. The valsartan capsule can be disintegrated and dissolved out quickly, and is simple in technology and stable in quality.