Crack-resisting composite mortar

The invention discloses crack-resisting composite mortar which comprises the following components in percent by weight: 25-27 percent of cement, 15-17 percent of coarse sand, 32-34 percent of fine sand, 5-6 percent of ground calcium carbonate, 0.7-0.9 percent of redispersible latex powder, 0.09-0.1 percent of PP fiber and 17-19 percent of water. The crack-resisting composite mortar has the beneficial effects that since multiple components capable of increasing the toughness of the mortar are added and reasonably matched, these components can take effect very well so that the crack-resisting composite mortar is highly waterproof and ensures good toughness and wear resistance.