The invention provides a self-plugging releasing temperature resistant temporary plugging agent used for water-based 
drilling fluid, the self-plugging releasing temperature resistant temporary plugging agent comprises nano 
calcium carbonate and a product which is obtained by reacting 
starch, 
alkali metal hydroxide, halogenated 
organic acid, 
carbonate, a hydrophobic modification agent and 
alcohol with water. The invention also provides a preparation method of the self-plugging releasing temperature resistant temporary plugging agent used for the water-based 
drilling fluid, and the self-plugging releasing temperature resistant temporary plugging agent used for the water-based 
drilling fluid can be obtained by proportionally adding components into a kneading 
machine for kneading. The self-plugging releasing temperature resistant temporary plugging agent has strong high 
temperature resistance, and can 
resist the temperature up to 140 DEG C; and the self-plugging releasing temperature resistant temporary plugging agent has good temporary plugging effect and significant reservoir protection effect, and the water-based drilling fluid added with the temporary plugging agent has high temporary plugging rate and 
oil phase permeability 
recovery rate; at the same time, the temporary plugging agent has self-plugging releasing ability. During the late flowback, the self-plugging releasing can be realized by formation of a hydrophobic channel without 
acid washing for mud cake removal and other processes, and secondary damage to a reservoir can be avoided.