The invention provides a sandwich permanent magnet synchronous motor rotor structure with solid-lamination axial direction compound, belonging to the motor technology field. Problems that starting performance of a cage type induction motor is poor, operation efficiency of a solid rotor induction motor is low, and a price of a permanent magnet synchronous motor is expensive are solved. A left lamination rotor part, a solid rotor part and a right lamination rotor part of the rotor structure are sleeved on a rotor shaft in order and are installed on the rotor shaft through key iron. An aluminum magnetic isolation body and a permanent magnet pole are respectively placed in radial slots of the two lamination rotor parts. Aluminum bronze slot wedges are embedded in dovetail slots at openings of the radial slots of the two lamination rotor parts. Iron copper alloy starting cages are embedded in an axially through groove which is formed after installation of the left lamination rotor part, the solid rotor part and the right lamination rotor part. A left end protecting cover and a right end protecting cover are installed at outer side surfaces of the left lamination rotor part and the right lamination rotor part and are in cooperation fixation with rectangular terminals at two ends of the iron copper alloy starting cages through a respective rectangular aperture.