The invention belongs to the technical field of water meters and accessories thereof, and particularly relates to a domestic water meter with a water purification function. The domestic water meter comprises a shell of the water meter and water outlets which are connected with the shell, a metering module is arranged in the shell, and a water purification mechanism is further arranged on the shell; the water purification mechanism mainly comprises a water purification assembly arranged in a main body; the water purification assembly comprises an outer shell and a center pipe which is arrangedin the center of the outer shell, and a laminated flow channel, an outer filter membrane, an outer permeation liquid collecting layer, an inner filter membrane and an inner permeation liquid collecting layer are arranged between the outer shell and the center pipe from outside to inside in sequence. By means of the domestic water meter with the water purification function, through the arrangementof the water purification mechanism, metered water is partially purified for people to drink, and another part of unpurified water can be used in daily life; meanwhile, the water flows out of different water outlets, mutual influence is avoided, so that water drunken by people is cleaner, and people's bodies are better protected.