This　article　investigates　the　change　rule　of　the　microstructure,　hardness　and　wear　resistance　of　high　boron　steel　containing　0.1　wt.%　to　0.5　wt.%　boron　in　the　cast　state　and　after　quenching　at　different　temperatures.　The　results　show　that　the　microstructure　of　cast　high　boron　steel　with　different　contents　of　boron　is　composed　of　pearlite,　ferrite　and　eutectic　boride,　which　has　lower　hardness　and　wear　resistance,　and　the　higher　the　content　of　boron,　the　higher　the　hardness　and　the　better　the　wear　resistance.　After　quenching　at　900-1,000　degrees　C,　pearlite　and　ferrite　change　into　a　large　number　of　lamellar　martensite　and　a　small　amount　of　lath　martensite.　After　high-temperature　quenching　at　1,050　degrees　C,　retained　austenite　appears　in　the　microstructure　in　addition　to　martensite,　and　borides　are　partially　dissolved.　The　hardness　and　wear　resistance　are　significantly　improved　compared　to　the　as-cast　high　boron　steel.　As　the　quenching　temperature　increases,　the　dissolution　of　boride　is　obvious,　the　hardness　and　wear　resistance　are　firstly　increased　and　then　decreased.　When　the　content　of　boron　is　0.5　wt.%　and　the　quenching　temperature　is　1,000　degrees　C,　the　hardness　reaches　a　maximum　value　of　59.0　HRC,　and　the　abrasion　resistance　is　the　best.