The invention discloses a crushing transportation connecting device for an underground coal mine belt roadway. The crushing transportation connecting device is arranged between a first belt conveyor and a second belt conveyor of the underground coal mine belt roadway; one end of a first conveying trough is fixedly connected with a tail; the other end of the first conveying trough is fixedly connected with one end of a port groove of a first crusher; the other end of the port groove of the first crusher is fixedly connected with a feeding hole of the first crusher; a discharging hole of the first crusher is fixedly connected with one end of a port groove of a second crusher; the other end of the port groove of the second crusher is fixedly connected with a second conveying trough; the other end of the second conveying trough is fixedly connected with a nose; a tail rack, a first conveying trough group rack, a first crusher port groove group rack, a crusher rack, a second crusher port groove group rack, a second conveying trough group rack and a nose rack are in seamless joint; a scraper chain moves along the upper surface of a rack plane; and a returning space is used for accommodating the returning scraper chain to meet the narrow and compact environment of the belt roadway and finish the material receiving, crushing, transporting and re-unloading functions.