An adjustable pitch changing device having a front end support based on inclined hinge blades, comprising blades, a hub, a fan main shaft, a front end support connecting assembly, and a front-end variable pitch adjusting assembly; each blade of the wind power generator device is an inclined hinge blade; the root portion of the blade is connected to the hub by means of an inclined hinge assembly; the middle front portion close to the root portion of the blade is connected to the front-end variable pitch adjusting assembly by means of the front end support connecting assembly; the front-end variable pitch adjusting assembly mainly consists of a base flange, a main support shaft, a lead screw and a variable pitch motor; the variable pitch motor drives the lead screw, and the front end support connecting assembly enables the inclined hinge blade to generate out-plane tilting, so that a corresponding windward attack angle of the blade can be significantly changed to achieve a pitch changing effect. By means of hinge support, the connection of the root portion of the blade bears no bending moment, and the stress state of the fan device is greatly improved. The device provided by the invention has a simple structure, balanced stress, control convenience and the like, and is suitable for variable pitch adjustment of large/medium fans.