An electromechanical lock, - comprising at least one housing fixed to a door, where the housing delimits an internal space in which different elements of mechanisms and devices are housed, furthermore comprising front plates (1a,1b) opposite through holes, the front plates are fixed to the door and the frame; - a drive lever located inside the housing that pivots on a fixed shaft, above which a fixed guide rod is located, with a first spring working by compression and a double latch retainer that are coupled to said fixed guide rod; - the retainer is moved towards the inside of the housing against the resistance of the first spring when the door is closed and comes into contact with the frame, wherein this backwards movement of the retainer drags the drive lever by means of a second spring working by torque and is coupled to the fixed shaft, said drive lever rotating in an anti-clockwise direction, in turn dragging a closure latch in a forwards direction, until reaching an advanced closure position, whereby an upper portion of the drive lever is linked to the first spring; - moreover comprising at least one additional device for acting on the drive lever and making it to rotate in a clockwise direction, wherein the closure latch moves backwards thereby releasing the door opening; - also comprising a closure latch locking device to prevent the door from being forced open by inappropriately moving the closure latch backwards; characterised in that: - the locking device comprises a self-locking lever, which pivots on a fixed front shaft integrally joined to the housing, said fixed front shaft being located above the closure latch; the self-locking lever having a first lower angular recess and a second lower inverted V-shaped recess opposite a copier shaft integrally joined to the drive lever, the self-locking lever furthermore being provided with an open channel opposite a spool built into a guide shaft located above the copier shaft, wherein said guide shaft is integrally joined to the drive lever; - the first lower angular recess of the self-locking lever is complemented with a rear cornered area of the closure latch, said rear cornered area buts against said first lower angular recess when the self-locking lever is located in a resting position in which the copier shaft is found inside the second lower inverted V-shaped recess and the closure latch is in the advanced door closed position; - the spool of the guide shaft constitutes a means for driving the self-locking lever as it rotates as a result of the rotation of the drive lever, wherein the self-locking lever is initially driven via the copier shaft. - comprising at least one housing fixed to a door, where the housing delimits an internal space in which different elements of mechanisms and devices are housed, furthermore comprising front plates (1a,1b) opposite through holes, the front plates are fixed to the door and the frame; - a drive lever located inside the housing that pivots on a fixed shaft, above which a fixed guide rod is located, with a first spring working by compression and a double latch retainer that are coupled to said fixed guide rod; - the retainer is moved towards the inside of the housing against the resistance of the first spring when the door is closed and comes into contact with the frame, wherein this backwards movement of the retainer drags the drive lever by means of a second spring working by torque and is coupled to the fixed shaft, said drive lever rotating in an anti-clockwise direction, in turn dragging a closure latch in a forwards direction, until reaching an advanced closure position, whereby an upper portion of the drive lever is linked to the first spring; - moreover comprising at least one additional device for acting on the drive lever and making it to rotate in a clockwise direction, wherein the closure latch moves backwards thereby releasing the door opening; - also comprising a closure latch locking device to prevent the door from being forced open by inappropriately moving the closure latch backwards; - the locking device comprises a self-locking lever, which pivots on a fixed front shaft integrally joined to the housing, said fixed front shaft being located above the closure latch; the self-locking lever having a first lower angular recess and a second lower inverted V-shaped recess opposite a copier shaft integrally joined to the drive lever, the self-locking lever furthermore being provided with an open channel opposite a spool built into a guide shaft located above the copier shaft, wherein said guide shaft is integrally joined to the drive lever; - the first lower angular recess of the self-locking lever is complemented with a rear cornered area of the closure latch, said rear cornered area buts against said first lower angular recess when the self-locking lever is located in a resting position in which the copier shaft is found inside the second lower inverted V-shaped recess and the closure latch is in the advanced door closed position; - the spool of the guide shaft constitutes a means for driving the self-locking lever as it rotates as a result of the rotation of the drive lever, wherein the self-locking lever is initially driven via the copier shaft.