A method of recovering and utilizing crane operating energy, comprising: converting, by a first hydraulic power means, hydraulic energy generated by a hydraulic actuator into mechanical energy of a transmission shaft; driving, by the transmission shaft, a second hydraulic power means to rotate so as to convert the mechanical energy of the transmission shaft into mechanical energy of the second hydraulic power means; filling, by the second hydraulic power means, pressurized oil into an accumulator so as to convert the mechanical energy of the second hydraulic power means into hydraulic energy for storage; characterized in that in the process of driving, by the transmission shaft, the second hydraulic power means to rotate so as to convert the mechanical energy of the transmission shaft into mechanical energy of the second hydraulic power means, further comprising: acquiring, in real time, a load torque T h output by the first hydraulic power means to a transfer case, wherein an engine and the second hydraulic power means are connected to the first hydraulic power means via the transfer case; acquiring a maximum recovery torque T x max of the second hydraulic power means; judging whether or not T x max is less than T h; maximizing a displacement of the second hydraulic power means such that a recovery torque of the second hydraulic means T x = T x max, and balancing T h by T x in cooperation with a braking torque of the engine, if T x max is less than T h; adjusting the displacement of the second hydraulic power means, such that the recovery torque of the second hydraulic means T x = T h, if T x max is no less than T h. converting, by a first hydraulic power means, hydraulic energy generated by a hydraulic actuator into mechanical energy of a transmission shaft; driving, by the transmission shaft, a second hydraulic power means to rotate so as to convert the mechanical energy of the transmission shaft into mechanical energy of the second hydraulic power means; filling, by the second hydraulic power means, pressurized oil into an accumulator so as to convert the mechanical energy of the second hydraulic power means into hydraulic energy for storage; characterized in that in the process of driving, by the transmission shaft, the second hydraulic power means to rotate so as to convert the mechanical energy of the transmission shaft into mechanical energy of the second hydraulic power means, further comprising: acquiring, in real time, a load torque T h output by the first hydraulic power means to a transfer case, wherein an engine and the second hydraulic power means are connected to the first hydraulic power means via the transfer case; acquiring a maximum recovery torque T x max of the second hydraulic power means; judging whether or not T x max is less than T h; maximizing a displacement of the second hydraulic power means such that a recovery torque of the second hydraulic means T x = T x max, and balancing T h by T x in cooperation with a braking torque of the engine, if T x max is less than T h; adjusting the displacement of the second hydraulic power means, such that the recovery torque of the second hydraulic means T x = T h, if T x max is no less than T h. acquiring, in real time, a load torque T h output by the first hydraulic power means to a transfer case, wherein an engine and the second hydraulic power means are connected to the first hydraulic power means via the transfer case; acquiring a maximum recovery torque T x max of the second hydraulic power means; judging whether or not T x max is less than T h; maximizing a displacement of the second hydraulic power means such that a recovery torque of the second hydraulic means T x = T x max, and balancing T h by T x in cooperation with a braking torque of the engine, if T x max is less than T h; adjusting the displacement of the second hydraulic power means, such that the recovery torque of the second hydraulic means T x = T h, if T x max is no less than T h.