The invention discloses an elbow joint rehabilitation training device with an adjustable front arm. The device comprises a big arm supporting frame and an elbow joint bending and stretching mechanism,the elbow joint bending and stretching mechanism is arranged on the big arm supporting frame and comprises a rocking rod with the middle part rotatably connected with the big arm supporting frame, the rocking rod can swing relative to the big arm supporting frame, and a big arm supporting plate extends out of the upper portion of the rocking rod; a sleeve movably sleeves the rocking rod and is detachably fixed to the rocking rod, and a front arm fixing assembly is detachably installed on the sleeve. Through the movable sleeve and the front arm fixing assembly, the elbow joint bending and stretching mechanism can meet the training requirements of different users, and the device has the advantages that adjustment is convenient, the practicability is high, and the rehabilitation effect of apatient can be improved.