The umbrella-type triplet electromagnetically induced transparency (EIT) effect driven by two coupling fields with strontium cold atoms in the magneto-optical trap as medium is observed experimentally. The Pound-Drever-Hall frequency stabilization technique and the injection locking technique are applied to the pumping laser in the experiment, and the power stabilization technique for the weak probe laser is also used. The experimental observation precision is improved by these techniques. The experimental results prove that the detuning of coupling lights has relatively great influence on the triplet EIT. Moreover, the line shape of EIT is a simple superposition of two Λ-type EIT line shapes.