Self-lubricating liquid for environment-friendly automobile steel plate, preparation method of self-lubricating liquid and process for forming self-lubricating coating

The invention discloses self-lubricating liquid for an environment-friendly automobile steel plate, a preparation method of the self-lubricating liquid and a process for forming a self-lubricating coating. The self-lubricating liquid comprises the following components in parts by weight: 80-100 parts of deionized water, 20-60 parts of a water-soluble high-molecular polymer, 5-30 parts of inorganic microparticles and 1-3 parts of an auxiliary agent, the preparation method comprises the following steps: at the room temperature of 25 DEG C, sequentially adding the water-soluble high-molecular polymer, the inorganic microparticles and the auxiliary agent into the deionized water, uniformly stirring at the rotating speed of 300r/min, and grinding by adopting a three-roller machine until the particle size of the inorganic microparticles in the system is less than or equal to 5mu m, so as to obtain the self-lubricating liquid; a process for forming a self-lubricating coating by using the zinc-iron alloy steel plate