A front-furnace feeding device of blocking-resistant flame-resistant biomass boiler relates to a front-furnace feeding device. The invention settles the problems of easy obstruction and easy firing ofmaterial-receiving front chamber in the prior front-furnace feeding device of blocking-resistant flame-resistant biomass boiler. The material inlet end of material-receiving front chamber is installed with a flame-resistant baffle. The material outlet end of material-receiving front chamber is communicated with the side wall of casing. A centrifugal plate type feeder is installed in the material-receiving front chamber. A material obstruction controller is positioned between the centrifugal plate type feeder and the flame-resistant baffle. A material obstruction plate is installed in the material-receiving front chamber. A position sensor is installed outside the material-receiving front chamber. The material obstruction plate is connected with the position sensor. Two pitch-changing helical blades are symmetrically installed on a rotating shaft. The rotating shaft which is installed with the two pitch-changing helical blades is installed in the casing. Two end plates are respectivelycovered on two end planes of the casing. The rotating shaft is installed on a frame through a bearing. The output shaft of motor is connected with the rotating shaft. Two side walls of casing are respectively communicated with the upper end of inclining square drum of furnace wall. The front-furnace feeding device of blocking-resistant flame-resistant biomass boiler of the invention has the advantages of smooth material feeding, no easy obstruction of material bin and effective prevention to the firing of feeding device.