Crude monomer separation energy-saving device

The utility model provides an energy-saving crude monomer separation device, which is characterized in that crude monomers enter a rectifying tower I, high-boiling gas-phase substances are removed from the tower top and enter a tower kettle reboiler of a rectifying tower III for condensation, one part of the crude monomers are returned to the tower top of the rectifying tower I as tower reflux, and the other part of the crude monomers enter a rectifying tower II. Light components are extracted from the top of the rectifying tower II, and a rectifying tower III and a rectifying tower IV are extracted from the tower kettle; tower top gas-phase materials of the third rectifying tower enter tower kettle reboilers of the second rectifying tower and the fourth rectifying tower respectively, after condensation, one part serves as tower reflux and returns to the rectifying towers, and products are extracted from the other part; a methyl trichlorosilane product is extracted from the tower top of the fourth rectifying