A lightning current transmission system between the blades and the nacelle of a wind turbine comprising: - a metal band located at the root of each blade that receives lighting currents from one or more blade lightning current conductors located inside of each blade; - a metal ring located at the nacelle that transmits lightning currents to one or more lightning current conductors to drive them to earth; - a lightning current transmission element for transmitting lightning currents from the metal band of each blade to the metal ring comprising a conductive portion, an insulating portion and supporting means to be joined to the rotor hub; - the metal band of each blade and the metal ring are configured with protruding parts (61, 63) extended towards the lightning current transmission element; - the conductive portion of the lightning current transmission element comprises first and second receptors (47, 47') mounted on a base plate at different heights and oriented in a direction pointing, respectively, to the protruding parts (61, 63) of the metal band and the metal ring; characterised in that: - the base plate is configured with a pair of slotted holes (43, 43') placed at different heights and circular holes (45, 45') located in front of their centers; - the receptors (47, 47') are configured with a slotted hole (49, 49'); and - each receptor (47. 47') is mounted in the base plate with first fasteners positioned on a circular hole (45, 45') of the base plate and on an end of the slotted hole (49, 49') of the receptor (47, 47') and with second fasteners positioned on a suitable position of the slotted holes (43, 43'; 49, 49') of the base plate and the receptors (41; 47, 47'). - a metal band located at the root of each blade that receives lighting currents from one or more blade lightning current conductors located inside of each blade; - a metal ring located at the nacelle that transmits lightning currents to one or more lightning current conductors to drive them to earth; - a lightning current transmission element for transmitting lightning currents from the metal band of each blade to the metal ring comprising a conductive portion, an insulating portion and supporting means to be joined to the rotor hub; - the metal band of each blade and the metal ring are configured with protruding parts (61, 63) extended towards the lightning current transmission element; - the conductive portion of the lightning current transmission element comprises first and second receptors (47, 47') mounted on a base plate at different heights and oriented in a direction pointing, respectively, to the protruding parts (61, 63) of the metal band and the metal ring; - the base plate is configured with a pair of slotted holes (43, 43') placed at different heights and circular holes (45, 45') located in front of their centers; - the receptors (47, 47') are configured with a slotted hole (49, 49'); and - each receptor (47. 47') is mounted in the base plate with first fasteners positioned on a circular hole (45, 45') of the base plate and on an end of the slotted hole (49, 49') of the receptor (47, 47') and with second fasteners positioned on a suitable position of the slotted holes (43, 43'; 49, 49') of the base plate and the receptors (41; 47, 47').