The invention discloses a control method of chemkleen hydrogenation, which cancels recycle hydrogen and a recycle hydrogen compressor and comprises the following steps: hydrogen is mixed with fresh raw oil and part of recycle oil to form a mixture flow under the existence of a solvent and a thinning agent; the mixture flow enters a reactor, while the other part or the whole of the recycle oil is mixed with the hydrogen and then enters the reactor from among catalyst bed layers in one or different directions; a part of reactor effluent is taken as the recycle oil, while the solvent or the thinning agent is separated out from the other part thereof; the separated liquid product is taken as a product, the content of the hydrogen in the mixture flow is used for controlling the liquid amount in the reactor, the solubility of the hydrogen in the solvent or the thinning agent is greater than that of the hydrogen in the mixture of the fresh raw oil and the solvent or the thinning agent.