The invention provides an automatic control system for quartering hammers of a crawler type hydraulic excavator. The system comprises an electric system, a hydraulic system and an actuating mechanism. The electric system mainly comprises a central controller, a controller area network (CAN) bus, a monitor and a pedal switch. The hydraulic system comprises a main pump, a quartering hammer solenoid valve, a fist ball valve, a second ball valve, an overflow valve and a main valve. The actuating mechanism mainly comprises a quartering hammer. The automatic control system for quartering hammers of the crawler type hydraulic excavator enables a user to simply and conveniently operate and locate to an ideal working state of the quartering hammers. The electric system, the hydraulic system and the actuating mechanism are precisely matched. Accordingly, the whole machine is high in working efficiency and has broad application prospects in an energy saving and environment protection market. In addition, oil consumption is greatly reduced.