The invention provides an automobile sunroof movement mechanism with a water drainage function. The automobile sunroof movement mechanism comprises a body and a water drainage groove. The body is composed of a middle fixing plate, a fixing part at the rear end, and a downward pressing part at the front end. A movement base is arranged at the bottom end of the middle fixing plate. A pair of movable vertical plates are arranged at the top end of the movement base. Slide blocks are arranged at the top ends of the opposite side walls of the two movable vertical plates. A snap spring is assembled by clamping a snap spring fixing pin in a boss fixing frame at the front end of the water drainage groove, and fixed through a fixing card, the movement of a water drainage groove linkage mechanism is promoted, the snap spring leads the water drainage groove to move in cooperation when the mechanism moves up and down, and therefore water drainage can be more stable and thorough, and the automobile sunroof movement mechanism is more stable during movement.