Parallel groove clamp is one of the most commonly used power connection fittings in the power industry when performing live operations. It plays a vital role in ensuring the continuity and safe operation of power lines. In view of the fact that parallel groove wire clamps are prone to local overheating and excessive overall heat generation under the influence of different current directions, different bolt torques, and different external environments, this paper uses COMSOL software to establish a proportional simulation model of parallel groove wire clamps. In the case of different flow schemes, The temperature distribution and electromagnetic loss are analyzed. The results show that when the main line current is input, the electromagnetic loss of the clamp is smaller when the current is input from the left side; when the branch line current is input, the electromagnetic loss of the clamp is smaller when the current is output from both sides of the main line; when the current is input from the main line and the branch line in combination, the closer the two input current values are, the electromagnetic loss of the clampThe smaller the loss.