Abstract: Super large blocks of coal and rock brought from coal-wall slide and roof falling in full-mechanized mining face are main barriers influencing coal transportation，and block crushing is a technical puzzle which restricts safe and high-efficiency mining.Emulsion impact hammer was developed with low-frequency and over-loading theory.Its breakage ability was test with reinforcement concrete samples and marble slab samples on surface.Based on equipments layout characteristics at transfer points，block crushing equipment with double rocker arm was developed and tested underground.Surface and underground test showed that the equipment could realize one-off crushing of block whose hardness value f=4，and maximum crushing harness could reach f=10 under rigid supporting condition.Underground single or multi impact could realize effective crushing blocks whose length exceeded 1m，and could effectively unchoke jammed blocks with rocker arm，which improved breakage efficiency and safety.