Open-type current transformer

The utility model relates to an open-type current transformer which comprises a first magnetic ring, a second magnetic ring is hinged to the right side of the first magnetic ring, two clamping blocks are arranged on the opposite sides of the first magnetic ring and the second magnetic ring, a locking mechanism is arranged in the first magnetic ring, and the second magnetic ring is hinged to the second magnetic ring. The locking mechanism comprises a containing groove, a first limiting spring, a connecting rod, a clamping block, a clamping groove fixing plate, a second limiting spring, a clamping rod and a check block, and the containing groove is formed in the first magnetic ring. According to the open-type current transformer, firstly, a first magnetic ring is pulled, due to pushing of a first limiting spring, a connecting rod drives a clamping block to enter a clamping groove, at the moment, a clamping rod can be driven to be clamped into a groove of the clamping block by pushing a check block, and therefor