The invention discloses a manufacturing method for high-performance rubber-type chlorinated polyethylene with the water-phase method. The manufacturing method comprises the following steps of: softening hot water, dispersing agent, emulsifying agent and polyethylene powder are added in a proportioning tank in turn and are stirred to form suspension feed liquid, then completing discharging; the suspension feed liquid in the proportioning tank is fed in a chlorination reaction kettle, and then initiator is added; when the mixture is heated to 75 DEG C under a sealed condition, chlorine gas is pumped into the reaction kettle, thereby obtaining the mother liquor of rubber-type chlorinated polyethylene after 2 to 3 hour reaction under 75 to 140 DEG C and pressure less than or equal to 0.45MPa;and the mother liquor is fed to a rinsing kettle to be filtered and then is neutralized through a neutralization kettle, and is made into a high-performance rubber-type chlorinated polyethylene finished product after washing, dehydration and drying. The manufacturing method has high production efficiency and stable product quality and can realize the recycling of waste water after treatment.