The utility model provides a cooling device for a float glass tin pot. The cooling device comprises single-beam water bags in a high temperature area, double-beam water bags in a first moderate temperature area, double-beam water bags in a second moderate temperature area, double-beam water bags in a third moderate temperature area, double-beam water bags in a fourth moderate temperature area, double-beam water bags in a first low temperature area, double-beam water bags in a second low temperature area and double-beam water bags in a third low temperature area which are sequentially distributed from front to rear in the length direction of the tin pot. According to the cooling device, by inserting the single-beam water bags in the high temperature area, the double-beam water bags in the first moderate temperature area, the double-beam water bags in the second moderate temperature area, the double-beam water bags in the third moderate temperature area, the double-beam water bags in the fourth moderate temperature area, the double-beam water bags in the first low temperature area, the double-beam water bags in the second low temperature area and the double-beam water bags in the third low temperature area in the width direction of the tin pot, the problem of the large transverse temperature difference of a glass belt can be solved, and the transverse temperature difference inside the tin pot can be controlled within 10-20 DEG C, or even below 10 DEG C.