The invention provides a plane fifteen-rod three-activity electro-hydraulic hybrid type heavy controllable loading mechanism. The plane fifteen-rod three-activity electro-hydraulic hybrid type heavy controllable loading mechanism comprises a multi-unit linear driving mechanism, a movable arm lifting mechanism, a bucket control mechanism and the like. The multi-unit linear driving mechanism conducts power input through multiple sets of small-power linear drivers, large-power and high-torque power output is achieved through a crankshaft, and the high-load operation requirements of the loading mechanism are met. The movable arm lifting mechanism is driven by an electric transmission system, energy consumption is effectively reduced compared with an existing hydraulic loading machine, the problem that two lifting branched chains of a movable arm are unbalanced in stress is effectively solved by introducing a hydraulic element, and the bearing stability is improved. Due to the fact that the load of the bucket control mechanism is small, a mature hydraulic cylinder is adopted to control a bucket to turn over, and the structure compactness of an executing mechanism is ensured. The loading mechanism not only has the characteristics of being low in energy consumption, high in intelligent level and the like, but also has higher bearing performance and higher anti-vibration performance compared with an existing controllable loading mechanism; overload protection is easy to achieve; and the practicability is higher.