Control method and device of liquid cooling system, liquid cooling system and storage medium

The invention discloses a control method and device of a liquid cooling system, the liquid cooling system and a storage medium, and the method comprises the steps: when a low-temperature heat exchanger at a low-temperature tail end reaches a set defrosting entering condition, controlling a corresponding introduction channel in a first introduction channel and a second introduction channel to be opened according to the current state of a high-temperature tail end, the low-temperature heat exchanger at the low-temperature tail end enters a preset defrosting mode; according to the corresponding temperature in the outlet pipe temperature of the low-temperature heat exchanger at the low-temperature tail end and the outlet air temperature of the low-temperature heat exchanger at the low-temperature tail end, whether the low-temperature heat exchanger at the low-temperature tail end reaches the set defrosting quitting condition or not is determined; and if yes, the corresponding introduction channel in the first int