The invention discloses a long stator core shape detection method. The method comprises the following steps: a standard long stator core is used for carrying out zero calibration on a displacement sensor; a to-be-detected long stator core is arranged on a positioning trolley; the positioning trolley is pushed to a measurement position of a rack; the long stator core is positioned; a positioning assembly on an upper measurement substrate abuts against the long stator core; the long stator core is measured, and measurement heads on the upper measurement substrate and a lower measurement substrate are used for measuring correlated sizes of the shape of the long stator core; and measurement data are calculated, the measurement data are acquired via the measurement heads, the data are stored via calculation of a computer and printing, and red and green indication lamps on the computer display disqualification or qualification of the long stator core. The long stator core shape detection method has the advantages that the operation is convenient; the structure is scientific and reasonable; the measurement speed is fast; judgment is accurate; the measurement precision is high; and recalibration of other high-precision measurement instruments can be withstood.