The invention discloses a method for cleaning high-density drilling fluid mud cakes. According to the method of the invention, weighting flushing fluid is used together with a weighting agent mixed with coarse and fine grains and a tackifier, the turbulence time of pre-flushing fluid in an uncased hole is increased, and grinding by a grinding wheel is simulated. Therefore, the effect of physical well wall flushing is achieved, and the efficiency of cleaning is improved. The method of the invention is applied to well cementing operation in high-temperature and high-pressure well sections, and can effectively improve the efficiency of mud cake cleaning and improve the quality of cement bonding.