Electric submersible pump unit for 7-inch casing Y-shaped joint

The invention provides an electric submersible pump unit for a 7-inch casing Y-shaped joint, and belongs to the technical field of electric submersible pump unit equipment. The electric submersible pump unit comprises a submersible permanent magnet motor, a motor protector, an oil-gas separator and an electric submersible pump, wherein the electric submersible pump, the oil-gas separator, the motor protector and the submersible permanent magnet motor are connected in sequence. The submersible permanent magnet motor is divided into a head part, a middle part, a tail part and a motor outgoing line. The head part is provided with a motor headstock, the middle part is provided with a motor shell, a stator, a rotor, an alignment bearing sleeved on the motor shaft and the motor shaft from the outer side to the inner side, and the tail part is provided with a motor tailstock and a tail alignment bearing used for fixing the motor shaft. According to the invention, not only is the application of a 7-inch casing Y-shap