Current-limiting protection circuit, interface chip driver and interface chip

The invention provides a current-limiting protection circuit, an interface chip driver and an interface chip. The protection circuit comprises a current bias circuit, a first sampling resistor, a second sampling resistor, a first operational amplifier and a second operational amplifier, the sampling voltage of the differential output end of the interface chip driver is detected through the sampling resistor, and the sampling voltage is compared with the power supply reference voltage output by the current bias circuit through the operational amplifier. The operational amplifier works in a closed-loop state through a high-gain strong feedback loop of the operational amplifier, so that the maximum load current of the output end of the driver is also clamped on a preset current value corresponding to the reference voltage of the power supply, and the problem of chip burning caused by overlarge load current is effectively prevented; the area occupied by the sampling resistor is far smaller than that occupied by t