An ice making system comprising: a tank that stores a medium to be cooled; an ice making machine that cools the medium to be cooled and makes ice; a pump that circulates the medium to be cooled between the tank and the ice making machine; a de-icing mechanism that performs a de-icing operation of heating the medium to be cooled and melting the ice in the ice making machine; and a control device that controls operations of the ice making machine, the pump, and the de-icing mechanism, wherein the ice making machine includes a cooling chamber that cools the medium to be cooled, an inflow port through which the medium to be cooled flows into the cooling chamber, and a discharge port through which the medium to be cooled is discharged from the cooling chamber, wherein the ice making machine includes a blade mechanism that rotates in the cooling chamber to disperse ice, and wherein the control device activates the de-icing mechanism, wherein the ice making machine includes an inflow pressure sensor that detects a pressure of the medium to be cooled at the inflow port, and a discharge pressure sensor that detects a pressure of the medium to be cooled at the discharge port, wherein there is a detector that detects that the blade of the blade mechanism is caught by the ice adhering to the cooling chamber, wherein the control device calculates a pressure difference between the pressure detected by the inflow pressure sensor and the pressure detected by the discharge pressure sensor, and compares the pressure difference with a predetermined value, wherein the control device activates the de-icing mechanism when a pressure difference between a pressure of the medium to be cooled at the inflow port and a pressure of the medium to be cooled at the discharge port exceeds the predetermined value, wherein the control device stops the blade mechanism when the detector detects that the blade of the blade mechanism is caught by the ice during the de-icing operation, wherein the control device continuously drives the blade mechanism when the detector does not detect that the blade of the blade mechanism is caught by the ice during the de-icing operation, wherein the detector is a current sensor that detects a current value of a drive unit of the blade mechanism, wherein the control device stops the blade mechanism when the current value detected by the current sensor exceeds a predetermined threshold value, wherein the control device stops the de-icing operation when a time required for ice crystals in the tank to rise to a height at which the ice crystals in the tank are not discharged toward the ice making machine by activation of the pump has elapsed. a tank that stores a medium to be cooled; an ice making machine that cools the medium to be cooled and makes ice; a pump that circulates the medium to be cooled between the tank and the ice making machine; a de-icing mechanism that performs a de-icing operation of heating the medium to be cooled and melting the ice in the ice making machine; and a control device that controls operations of the ice making machine, the pump, and the de-icing mechanism, wherein the ice making machine includes a cooling chamber that cools the medium to be cooled, an inflow port through which the medium to be cooled flows into the cooling chamber, and a discharge port through which the medium to be cooled is discharged from the cooling chamber, wherein the ice making machine includes a blade mechanism that rotates in the cooling chamber to disperse ice, and wherein the control device activates the de-icing mechanism, wherein the ice making machine includes an inflow pressure sensor that detects a pressure of the medium to be cooled at the inflow port, and a discharge pressure sensor that detects a pressure of the medium to be cooled at the discharge port, wherein there is a detector that detects that the blade of the blade mechanism is caught by the ice adhering to the cooling chamber, wherein the control device calculates a pressure difference between the pressure detected by the inflow pressure sensor and the pressure detected by the discharge pressure sensor, and compares the pressure difference with a predetermined value, wherein the control device activates the de-icing mechanism when a pressure difference between a pressure of the medium to be cooled at the inflow port and a pressure of the medium to be cooled at the discharge port exceeds the predetermined value, wherein the control device stops the blade mechanism when the detector detects that the blade of the blade mechanism is caught by the ice during the de-icing operation, wherein the control device continuously drives the blade mechanism when the detector does not detect that the blade of the blade mechanism is caught by the ice during the de-icing operation, wherein the detector is a current sensor that detects a current value of a drive unit of the blade mechanism, wherein the control device stops the blade mechanism when the current value detected by the current sensor exceeds a predetermined threshold value, wherein the control device stops the de-icing operation when a time required for ice crystals in the tank to rise to a height at which the ice crystals in the tank are not discharged toward the ice making machine by activation of the pump has elapsed.