An electric lock, comprising a main lock which comprises a housing accommodating a driving assembly and a first connecting member , the driving assembly comprising a driving member and a rotating shaft which is rotatably arranged on the housing , a first threaded portion being arranged at one end of the rotating shaft , a second threaded portion adapted to the first threaded portion being arranged at one end of the first connecting member while a third threaded portion being arranged at the other end of the first connecting member , and a secondary lock which comprises a first sleeve , an elastic member and a second connecting member , the elastic member being arranged in the first sleeve and having one end abutting against the second connecting member , a fourth threaded portion adapted to the third threaded portion being arranged on the second connecting member , the second connecting member being able to move along the axis of the first sleeve ; wherein the driving member drives, via the rotating shaft , the first connecting member to move along the axis of the rotating shaft and to screw in the second connecting member , characterized in that the second connecting member is rotatably arranged in the first sleeve and wherein the secondary lock further comprises a manual unlocking assembly comprising a second sleeve and an unlocking member ; the second sleeve is arranged on the peripheral wall of the first sleeve and perpendicular to the first sleeve ; at the junction of the first sleeve and the second sleeve , a hollow region of the second sleeve is communicated with a hollow region of the first sleeve ; a fifth threaded portion is arranged on the unlocking member , and the unlocking member is rotatably arranged in the second sleeve ; a sixth threaded portion adapted to the fifth threaded portion is arranged on the second connecting member . a main lock which comprises a housing accommodating a driving assembly and a first connecting member , the driving assembly comprising a driving member and a rotating shaft which is rotatably arranged on the housing , a first threaded portion being arranged at one end of the rotating shaft , a second threaded portion adapted to the first threaded portion being arranged at one end of the first connecting member while a third threaded portion being arranged at the other end of the first connecting member , and a secondary lock which comprises a first sleeve , an elastic member and a second connecting member , the elastic member being arranged in the first sleeve and having one end abutting against the second connecting member , a fourth threaded portion adapted to the third threaded portion being arranged on the second connecting member , the second connecting member being able to move along the axis of the first sleeve ; wherein the driving member drives, via the rotating shaft , the first connecting member to move along the axis of the rotating shaft and to screw in the second connecting member , characterized in that the second connecting member is rotatably arranged in the first sleeve and wherein the secondary lock further comprises a manual unlocking assembly comprising a second sleeve and an unlocking member ; the second sleeve is arranged on the peripheral wall of the first sleeve and perpendicular to the first sleeve ; at the junction of the first sleeve and the second sleeve , a hollow region of the second sleeve is communicated with a hollow region of the first sleeve ; a fifth threaded portion is arranged on the unlocking member , and the unlocking member is rotatably arranged in the second sleeve ; a sixth threaded portion adapted to the fifth threaded portion is arranged on the second connecting member . <EOS>