Locking device for pedal vehicles, comprising: a first bushing configured to be mounted and secured to a first axial end of a sleeve hosting a central movement of the pedal vehicle; a first bearing mounted in a first housing of the first bushing; a second bushing configured to be mounted and secured to a second axial end of the sleeve; a second bearing mounted in a second housing of the second bushing; a cylindrical body which is an integral part of the first or second bushing (9, 18) and it is configured to be inserted into the sleeve, wherein the cylindrical body has a radial seat open radially at least towards the inside; a shaft having opposite ends (4, 5) configured to be rigidly constrained to respective pedals (6, 7), wherein the shaft is rotatably mounted in the first and second bushing (9, 18) and in the cylindrical body through the first and the second bearing (17, 23); characterized by a lock integrated into the shaft and provided with a respective key; at least one pin at least partially housed in the shaft; wherein said lock is operatively connected to the pin to move the pin radially between a radially retracted position, in which the pin lies outside of the radial seat, and a radially extracted position, in which the pin lies at least partially in the radial seat and prevents rotation of the shaft with respect to the cylindrical body and to the sleeve; wherein at least one between the first and the second housing (16, 22) is open axially towards the outside to allow access to the respective bearing (17, 23); wherein the locking device further comprises a latching mechanism for a safety jack, wherein said jack is constrained or constrainable to a safety chain; wherein said latching mechanism is internal to the shaft. a first bushing configured to be mounted and secured to a first axial end of a sleeve hosting a central movement of the pedal vehicle; a first bearing mounted in a first housing of the first bushing; a second bushing configured to be mounted and secured to a second axial end of the sleeve; a second bearing mounted in a second housing of the second bushing; a cylindrical body which is an integral part of the first or second bushing (9, 18) and it is configured to be inserted into the sleeve, wherein the cylindrical body has a radial seat open radially at least towards the inside; a shaft having opposite ends (4, 5) configured to be rigidly constrained to respective pedals (6, 7), wherein the shaft is rotatably mounted in the first and second bushing (9, 18) and in the cylindrical body through the first and the second bearing (17, 23); characterized by a lock integrated into the shaft and provided with a respective key; at least one pin at least partially housed in the shaft; wherein said lock is operatively connected to the pin to move the pin radially between a radially retracted position, in which the pin lies outside of the radial seat, and a radially extracted position, in which the pin lies at least partially in the radial seat and prevents rotation of the shaft with respect to the cylindrical body and to the sleeve; wherein at least one between the first and the second housing (16, 22) is open axially towards the outside to allow access to the respective bearing (17, 23); wherein the locking device further comprises a latching mechanism for a safety jack, wherein said jack is constrained or constrainable to a safety chain; wherein said latching mechanism is internal to the shaft.