The invention discloses a high current rotary indoor high-voltage isolating switch which comprises a stainless steel chassis, an aluminum clamp and three phases of conducting units arranged on the stainless steel chassis side by side. Each phase of the conducting units comprises two contact seats, a sleeve pipe with a conductive pipe, and two groups of contact piece groups which are at the upper and lower part of the two sides of the stainless steel chassis, and the contact piece groups are corresponding to two ends of the conductive pipe. The contact seat is square, each group of contact piece group comprises multiple rows of copper fingers, a support seat and multiple pairs of stainless steel support plates, one end of each of the copper fingers in a parallel arrangement is fixed between the contact seat and the support seat, the middle parts of the multiple pairs of stainless steel support plates are fixed at two sides of one end of the contact seat through elastic pressing mechanisms. The contact piece groups of the invention have elasticity and good conductivity, the dynamic thermal stability of the switch is increased according to a groove magnetic lock plate, the reliability is improved, and the working life of a high voltage switch cabinet is prolonged.