The invention discloses a convenient and temperature adjustable valve core, which comprises a shell, a temperature adjusting rotary knob, a switching assembly and a center bolt, wherein the shell comprises a main body and a water channel; the temperature adjusting rotary knob is movably connected with the main body; a hot water inlet and a cold water inlet are arranged on the water channel, and amixed water path is formed in the water channel; the center bolt is positioned in the shell, and a return spring is arranged between the center bolt and the main body; an adjusting wall is arranged atthe position where the the center bolt corresponds to the hot water inlet; the adjusting wall is used for controlling the amount of water entering the hot water inlet; the center bolt comprises a joint part, a disk body and a piston part; the switching assembly drives the center bolt to move axially through the joint part, and the temperature adjusting rotary knob is connected with the disk bodyto drive the center bolt to rotate. The convenient and temperature adjustable valve core provided by the invention integrates two functions of temperature adjusting and water discharging simultaneously by using a simple structure, and the valve core has a small volume and a good hand pressing feel.