Load detection circuit and load detection method

The invention discloses a load detection circuit and a load detection method. The load detection circuit comprises a direct current power supply module with an enabling function, a constant current source power supply module, a first sampling module, a single chip microcomputer module and an output module, the first output end is connected with the first end of the constant current source power supply module, and a control switch is connected between the first output end and the first end of the direct current power supply module; the constant-current source power supply module is further connected with the first end of the first sampling module, the control switch is in an open circuit under the default condition, the direct-current power supply module does not supply power to the outside under the default condition, and the constant-current source power supply module outputs constant current to the outside; when the single-chip microcomputer recognizes that the load is connected according to the sampling vo