The invention provides a liquid cooling battery cooling system and belongs to the field of liquid cooling battery cooling. The liquid cooling battery cooling system comprises a battery unit module anda cooling system shell. The battery unit module comprises a battery unit shell, a battery groove member, heat conducting glue, a battery, honeycomb fins, a cooling liquid groove and a parallel circuit. The heat generated when the battery works is fully transferred to the battery groove member through the fully-wrapped heat conducting glue, and meanwhile the temperature difference of different areas of the battery unit module can be effectively reduced, so that the battery is always in a good operating environment. The honeycomb-shaped fins are used for connecting the battery groove member with the battery unit shell so as to ensure stability; secondly, the contact area of the battery groove member and cooling liquid can be improved to the most degree, so that the heat dissipation efficiency is maximized. Liquid circulation flow is achieved through an external water pump so as to achieve the purpose of rapid heat dissipation.