Main transformer and radiator circulating pipeline valve locking device

The invention provides a main transformer and radiator circulating pipeline valve locking device, relates to locking devices and aims to solve the problems of valve abrasion, non-circulation of transformer oil caused by locked valve after maintenance, valve oil injection accidents due to release of too high internal pressure of the main transformer caused by too high temperature of the main transformer, and power failure accidents caused by tripping of the main transformer switch. The locking device comprises a locking body and a padlock, wherein the locking body is composed of a left locking piece, a right locking piece, a valve locking and positioning opening and device lockholes. The valve locking device can protect the valve and the control pin and prolong the service lives of the valve and the control pin; and meanwhile, during maintenance, the valve is required to be closed for unlocking, and after maintenance, the valve is required to be opened for locking again, so that the device can remind workers o