The invention discloses a mold bag type concentration filling device and method for an end head of a mine. The device comprises a filling mold bag and a concentration grouting device, the concentration casting device comprises a grout concentration mechanism and a grouting mechanism, and the grout concentration mechanism comprises a clarifying tank, a setting pond and a concentration pond; the grouting mechanism is a piston pump, the piston pump is in sealing communication with a filling opening in the filling mold bag, and a grouting assembly is arranged on the setting pond and comprises a feeding pipe, a grout inlet pipe and a liquid inlet pipe; the method comprises the following steps that step one, high-water filling grout is precipitated; step two, filling is conducted on the fillingmold bag. The method is simple in operation, the high-water filling grout is precipitated many times to form concentration serous fluid, the filling mold bag is filled with concentration serous fluidthrough a booster pump to form a sealing wall, the sealing wall is ensured to be stable, so that it is avoided that due to the fact that the high-water filling grout flows out, the material losing andwaste are caused and the quality of the sealing wall body is influenced, and the practicability is high.