This paper proposes a universal protection platform based on embedded soft-core PLC. Traditional software programming has poor flexibility and weak field configurability. After analyzing the characteristics and advantage of embedded PLC soft-core, we implement a universal protection platform based on embedded PLC soft-core. We design the system structure of protection platform based on PLC soft-core, then transplant and debug the PLC soft-core on ARM9200-based hardware platform. We realize the widely used distribution grid protections, such as the differential protection, zero-sequence protection, inverse-time current protection by Structured Text Language, using modular design concept. At last, we take a 10 kV motor as protect object. Experimental analysis shows that the protection platform has good flexibility and versatility. The protection parameter meets GB/T 7261-2008 and GB/T 14598 GB requirements.