The invention discloses a wet mixing granulator. The wet mixing granulator comprises a base, a material cylinder, a stirring mechanism and a granulation mechanism, wherein a cylinder cover is arranged on the material cylinder; a feeding hopper and a liquid inlet apparatus are arranged on the cylinder cover; the stirring mechanism comprises a stirring paddle arranged at the bottom of the material cylinder and a stirring driving mechanism used for driving the stirring paddle to rotate; the granulation mechanism comprises a granulation tool arranged on one side of the material cylinder and a granulation motor used for driving the granulation tool to rotate; an output shaft of the granulation motor is in drive connection with a rotary shaft of the granulation tool; granulation blades are mounted at intervals on the rotary shaft of the granulation tool; each granulation blade comprises a blade body; a mounting part is arranged in the middle of each blade body; blade parts are annularly and uniformly distributed on the mounting parts; mounting holes matched with the rotary shaft of the granulation tool are formed in the mounting parts; each blade part comprises a blade back integrally formed with each mounting part and a blade mounted on the blade back; and cutting edges of the blades are in arc shapes inwards recessed towards the blade backs.