Disclosed is an engine cooling fan, the cooling fan comprising: a first blade shaft (100), a plurality of first blades (110) being provided on the first blade shaft (100); a second blade shaft (200), a plurality of second blades (210) being provided on the second blade shaft (200), and the first blade shaft (100) rotatably embedded within the second blade shaft (200); a drive motor, the drive motor being connected to the first blade shaft (100) to drive the first blade shaft (100) to rotate; and a torsion spring (300), with one end of the torsion spring (300) being connected to the first blade shaft (100) and the other end of the torsion spring (300) being connected to the second blade shaft (200). The cooling fan realizes width adjustable fan blades, meets the requirements of air flow for the engine, and generally reduces the overall fuel consumption of the vehicle. Meanwhile, further disclosed are a cooling fan assembly comprising the above-mentioned engine cooling fan and a vehicle having the cooling fan assembly.