The invention provides a protection device for a trip coil of a switchgear. The protection device is characterized by comprising an operation power supply, a working coil of a tripping device, a control switch, an auxiliary switch and a delay protection device, wherein the delay protection device cuts off current in the working coil of the tripping device within a set time. A delay module starts to calculate delay time while the working coil of the tripping device is electrified, a delay switch module is driven to switch when the delay time reaches a set value, and the current in the working coil of the tripping device is cut off, so that the coil is prevented from being burnt for long-time electrification when a fault occurs to the switchgear or the voltage of the power supply is low. No matter whether the switchgear has a problem or whether the auxiliary switch is switched, the delay module cuts off the current in the working coil of the tripping device within the set time through the delay switch module.