Abstract: Locking device for locking a movement side of a wind turbine blade mould to a floor at a desired level, the locking device having a first locking component for mounting to a floor surface and a second locking component adapted to be fitted to a movement side of a wind turbine blade mould to be locked by the locking device, wherein one of the first and second locking components includes a clamp engaging member, and the other of the first and second locking components includes an actuator and a clamp member coupled to the actuator, the clamp member being movable by operation of the actuator between a retracted position and an extended position, the clamp member including a clamp surface which in one of the retracted and extended positions is arranged to apply a clamping force on the clamp engaging member.