An energy recovery control circuit provided with an energy recovery system for recovering energy from a work equipment having a boom that is vertically moveable by a first boom cylinder (17c1) and a second boom cylinder (17c2), the energy recovery control circuit comprising: the first boom cylinder (17c1) and the second boom cylinder (17c2), which are arranged in parallel with each other, an accumulator, a recovery control valve block in which a plurality of valves that constitute the energy recovery system are incorporated, wherein: the recovery control valve block has functions such that the potential energy the boom has at a raised position is accumulated in the accumulator from the first boom cylinder (17c1) during boom-down operation and that the fluid accumulated in the accumulator is directly released to the first and second boom cylinders (17cl, 17c2) during boom-up operation; characterised in that the recovery control valve block includes a single main spool, in which a plurality of control characteristics concerning recovery of energy are consolidated, the main spool having: an inflow rate control characteristic for controlling pressure accumulation inflow rate from the first boom cylinder (17c1) into the accumulator; an unload control characteristic for controlling unload from the second boom cylinder (17c2); a switching control characteristic for controlling switching of the first boom cylinder (17c1) and the second boom cylinder (17c2) between communication and separation; and a release rate control characteristic for controlling release flow rate from the accumulator to the first boom cylinder (17c1) and the second boom cylinder (17c2). the first boom cylinder (17c1) and the second boom cylinder (17c2), which are arranged in parallel with each other, an accumulator, a recovery control valve block in which a plurality of valves that constitute the energy recovery system are incorporated, wherein: the recovery control valve block has functions such that the potential energy the boom has at a raised position is accumulated in the accumulator from the first boom cylinder (17c1) during boom-down operation and that the fluid accumulated in the accumulator is directly released to the first and second boom cylinders (17cl, 17c2) during boom-up operation; characterised in that the recovery control valve block includes a single main spool, in which a plurality of control characteristics concerning recovery of energy are consolidated, the main spool having: an inflow rate control characteristic for controlling pressure accumulation inflow rate from the first boom cylinder (17c1) into the accumulator; an unload control characteristic for controlling unload from the second boom cylinder (17c2); a switching control characteristic for controlling switching of the first boom cylinder (17c1) and the second boom cylinder (17c2) between communication and separation; and a release rate control characteristic for controlling release flow rate from the accumulator to the first boom cylinder (17c1) and the second boom cylinder (17c2). the recovery control valve block has functions such that the potential energy the boom has at a raised position is accumulated in the accumulator from the first boom cylinder (17c1) during boom-down operation and that the fluid accumulated in the accumulator is directly released to the first and second boom cylinders (17cl, 17c2) during boom-up operation; characterised in that the recovery control valve block includes a single main spool, in which a plurality of control characteristics concerning recovery of energy are consolidated, the main spool having: an inflow rate control characteristic for controlling pressure accumulation inflow rate from the first boom cylinder (17c1) into the accumulator; an unload control characteristic for controlling unload from the second boom cylinder (17c2); a switching control characteristic for controlling switching of the first boom cylinder (17c1) and the second boom cylinder (17c2) between communication and separation; and a release rate control characteristic for controlling release flow rate from the accumulator to the first boom cylinder (17c1) and the second boom cylinder (17c2). an inflow rate control characteristic for controlling pressure accumulation inflow rate from the first boom cylinder (17c1) into the accumulator; an unload control characteristic for controlling unload from the second boom cylinder (17c2); a switching control characteristic for controlling switching of the first boom cylinder (17c1) and the second boom cylinder (17c2) between communication and separation; and a release rate control characteristic for controlling release flow rate from the accumulator to the first boom cylinder (17c1) and the second boom cylinder (17c2).