The invention discloses a hybrid power assembly device for a new energy vehicle. The hybrid power assembly device comprises an engine, a clutch coupling type motor and a speed changing box which are coaxially connected in series; a separation clutch is integrated with a driving motor; the separation clutch and the driving motor are arranged in parallel; the separation clutch is coupled into the inner part of a rotor of the driving motor; a control valve block is directly arranged on a shell of the clutch coupling type motor; the speed changing box is a double-clutch automatic speed changing box; the separation clutch and an inner clutch of double clutches of the speed changing box are universal; the separation clutch and the speed changing box adopt a common oil source design; according to the hybrid power assembly device, a torsional vibration reduction device on the front face of the double clutches of the speed changing box is not used; the torsional vibration reduction device is additionally arranged between the engine and the separation clutch, and an engine flywheel is integrated with the torsional vibration reduction device; a double-mass flywheel design is adopted. The hybrid power assembly device for the new energy vehicle has the advantages of small axial size, compact structure, convenience for assembling and detecting, small changes of traditional vehicles and the like.