A transmission , comprising a box body with an inner cavity and a gear set and an oil supply device that are accommodated in the box body, wherein an oil sump carrying lubricating oil is disposed at the bottom of the inner cavity; the oil supply device is fastened on a side that is of the gear set and that is away from the oil sump , the oil supply device comprises a sealing chamber and an oil collection tank that are fastened to each other, and the oil collection tank is located above the sealing chamber ; an oil inlet port and at least one oil spray pipe are disposed for the sealing chamber , and the at least one oil spray pipe extends in different directions; and the sealing chamber is configured to: receive the lubricating oil that is in the oil sump and that is transported from the oil inlet port , and spray the lubricating oil to at least one to-be-lubricated part of the gear set through the at least one oil spray pipe ; and the oil collection tank has an upper opening, the oil collection tank is configured to: when the gear set rotates, receive, by using the upper opening, the lubricating oil that is in the oil sump and that is stirred and transported by the gear set , at least one oil transport tank is further disposed for the oil collection tank , a quantity of oil transport tanks is the same as a quantity of oil spray pipes , and any oil transport tank is disposed corresponding to one oil spray pipe , and is configured to lubricate a same to-be-lubricated part together with the corresponding oil spray pipe , wherein the transmission further comprises an oil transport component , the oil transport component comprises an oil transport pipeline and an oil transport pump , one end of the oil transport pipeline is connected to the oil inlet port of the oil supply device , the other end of the oil transport pipeline is connected to the oil sump , and the oil transport pump is configured to pump the lubricating oil in the oil sump into the sealing chamber through the oil transport pipeline . an oil sump carrying lubricating oil is disposed at the bottom of the inner cavity; the oil supply device is fastened on a side that is of the gear set and that is away from the oil sump , the oil supply device comprises a sealing chamber and an oil collection tank that are fastened to each other, and the oil collection tank is located above the sealing chamber ; an oil inlet port and at least one oil spray pipe are disposed for the sealing chamber , and the at least one oil spray pipe extends in different directions; and the sealing chamber is configured to: receive the lubricating oil that is in the oil sump and that is transported from the oil inlet port , and spray the lubricating oil to at least one to-be-lubricated part of the gear set through the at least one oil spray pipe ; and the oil collection tank has an upper opening, the oil collection tank is configured to: when the gear set rotates, receive, by using the upper opening, the lubricating oil that is in the oil sump and that is stirred and transported by the gear set , at least one oil transport tank is further disposed for the oil collection tank , a quantity of oil transport tanks is the same as a quantity of oil spray pipes , and any oil transport tank is disposed corresponding to one oil spray pipe , and is configured to lubricate a same to-be-lubricated part together with the corresponding oil spray pipe , wherein the transmission further comprises an oil transport component , the oil transport component comprises an oil transport pipeline and an oil transport pump , one end of the oil transport pipeline is connected to the oil inlet port of the oil supply device , the other end of the oil transport pipeline is connected to the oil sump , and the oil transport pump is configured to pump the lubricating oil in the oil sump into the sealing chamber through the oil transport pipeline . <EOS>