The invention discloses a siloxane-terminated polyether type lithium battery adhesive and a preparation method thereof. The preparation method comprises the following steps: 1) sequentially adding a solvent and cyanate into a reaction bottle, performing stirring and mixing, further adding a phase transfer catalyst, performing heating to 70-100 DEG C, and performing uniform constant temperature activation and dispersion for 30 minutes; and 2) respectively dropwise adding measured chlorosilane and polyether alcohol, or chlorosilane and polyester alcohol into the activation solution in the step 1), increasing the exothermic reaction temperature to 90-120 DEG C, maintaining the temperature range, performing a continuous reaction for 6-8 hours, after the reaction is completed, performing cooling to the room temperature, performing filtering so as to obtain filtrate, and removing the solvent, so as to obtain the siloxane-terminated polyether type lithium battery adhesive. The siloxane-terminated polyether type lithium battery adhesive disclosed by the invention is simple in preparation method, low in cost, high in efficiency, fast in adhesion and easy in industrialization. Prepared siloxane-terminated polyether for adhesion of lithium batteries is capable of improving the efficiency of the lithium batteries, high and low temperature resistance, stable charge and discharge efficiencyand bonding properties of the lithium batteries.