Transformer temperature controller convenient to maintain and produce

The invention discloses a transformer temperature controller convenient to maintain and produce. A capillary tube is composed of a preceding-stage capillary tube connected with a temperature sensing probe and a backward-stage capillary tube connected with a pushing diaphragm capsule, pressure communication between the preceding-stage capillary tube and the backward-stage capillary tube is achievedthrough a butt joint device, the volume change of a medium in a temperature sensing bulb due to expansion caused by heat and contraction caused by cold is accurately transmitted, a bellows arranged in the push diaphragm capsule is enabled to perform telescopic motion, the continuity of mechanical transmission is ensured, an instrument pointer is driven to rotate, and the temperature of a transformer is accurately monitored. Meanwhile, the instrument and a tail line are isolated into two independent medium sealing units by the butt joint device, so that the instrument can be separated from thetail line for maintenance