Abstract: To address the issue of fire and explosion caused by static electricity, SnO₂@wollastonite (SW) antistatic composite powder was prepared by hydrothermal synthesis method. The effects of coating amount, pH value, tin tetrachloride concentration, and other factors on the resistivity of the composite powder were studied, and its structure was characterized using SEM, TEM and XRD. The composite powder was further modified with dodecyl triethoxysilane, and the interaction mechanism between the silane and the composite powder was explored using infrared spectroscopy. The results show that when the coating amount is 26%, the pH value is 11, the tin tetrachloride concentration is 1 mol/L, the reaction time is 6 h, and the temperature is 180°C, the composite powder exhibits the lowest volume resistivity of 5.38×10⁵ Ω·cm, with uniform loading of nano-tin oxide on the surface of wollastonite and a particle size of 21.22 nm. The silane reacts with Sn-OH on the surface of the composite powder, forming Si-O-Sn bonds, which changes the composite powder from hydrophilic to hydrophobic, with an activation index of 99.9%. The modified composite powder (MSWP) was then incorporated into water-based epoxy resin (WBER) to prepare an antistatic coating with resistance to acid, alkali, and water. The study shows that when the MSWP content is 2%, curing time is 2 h, curing agent amount is 30%, and the water-to-epoxy emulsion ratio is 1∶1, the coating had the lowest resistivity of 1.70×10⁵ Ω·cm. The antistatic mechanism of the coating is that filler particles formed conductive chains through contact or via hopping, ballistic transport, tunneling, or diffusion processes.