The invention relates to a system and method capable of detecting remaining amount of paper of a tissue machine; the system comprises an input module, a manual intervention module, a control module and an execution module; the input module comprises a sensing module and a counting module, and the control module comprises a data processing module and a data display module; the execution module comprises a condition parameter module, a paper outlet control module, a paper shortage alarm module, a paper inlet control module and a data reset module. According to the invention, the paper allowancein the machine body can be accurately obtained through a simple calculation mode; through the design of the manual intervention module, paper allowance counting errors caused by machine body faults such as paper jam can be avoided, early warning can be conducted on the faults, and workers can maintain the paper allowance counting errors in time conveniently; by means of the design of the executionmodule, counting can be reset conveniently when paper is supplemented every time, the design that the paper inlet can be opened only after reset operation is executed is adopted, and the situation that paper allowance display errors are caused when paper is supplemented under the non-reset condition is avoided.