The invention discloses hydrogen-bonding hydrogel suitable for plugging cracks and caves. The hydrogen-bonding hydrogel comprises raw materials in parts by weight as follows: 5-10 parts of polyvinyl alcohol, 10-30 parts of polyols, 1-5 parts of a catalyst, 15-25 parts of salt, 0-100 parts of a weighting agent and 100 parts of water. The gelling time of the hydrogel is controllable, the initial setting time of the hydrogel is 120-240 min according to requirements of different layers, the time interval can basically meet most construction requirements, and the hydrogel can be formed from the room temperature to 90 DEG C; the hydrogel has sufficient strength, has certain cementing power with a formation, and cannot be crushed or remain in the cracks when bearing the pressure difference between a fluid in a well and the formation.