Cold water pre-drainage valve and water outlet device

The invention discloses a cold water pre-drainage valve and a water outlet device, and belongs to the technical field of sanitary products, and the cold water pre-drainage valve comprises a shell, a temperature sensing switch and a quantitative switch. The shell is provided with a containing cavity, a water inlet hole and a water outlet hole, the water inlet hole and the water outlet hole are communicated with the containing cavity, the temperature sensing switch comprises a first piston and a temperature sensing piece, and the first piston is arranged at the water inlet hole. The temperature sensing piece is connected to the first piston, so that the first piston can move to open or close the water inlet hole. The quantitative switch comprises a second piston and a quantitative mechanism, and the second piston is arranged at the water outlet hole and can be driven to move, so that the drainage hole is communicated or blocked. And the quantifying mechanism is connected with the second piston, and the quantify