The invention discloses an indoor high-voltage switch cabinet. A cabinet body adopts an assembled structure, and is divided into a bus chamber, a handcart chamber, a cable chamber and a relay instrument chamber through a horizontally assembled baffle and a vertically assembled baffle, which are connected with one another through bolts, nuts and riveting nuts; the bus chamber, the cable chamber and the handcart chamber are respectively provided with pressure release devices; the bus chamber is provided with a branch small bus, a bus sleeve, a main bus, a fixed contact device, a fixed contact box and a current transformer; the cable chamber is provided with a grounding switch, a cable feed line, a lightning arrester and a grounding bus; the relay instrument chamber is provided with relay protection elements, an instrument, high voltage presence indicating device and a control small bus; and the handcart chamber is provided with a secondary plug, a heating device, a breaker handcart and a screw rod mechanism. The indoor high-voltage switch cabinet has the advantages that the assembled structure has high strength, the outer appearance is artistic, the shape of an electrode is optimized, the structure is compact, the occupied space is small, the accuracy is high, the interchangeability is good, the oxidation resistance is good, the heat dissipation is good, large current can be transmitted, the voltage is high, all switches and rear cabinet doors have against incorrect operation and mechanical interlocking functions, and the five-prevention functions are complete.