A walk-behind self-propelled working machine , comprising: a main body comprising a moving assembly and a drive motor configured to drive the moving assembly; an operation switch connected to the drive motor; and a handle device connected to the main body; wherein the handle device comprises: an operation member comprising a gripping portion for a user to hold; a connecting rod connected to the main body; and a sensing module configured to sense a thrust that is applied to the handle device to drive the walk-behind self-propelled working machine and comprising a pressure sensor , whereby the sensing module is disposed between the operation member and the main body; characterized in that the sensing module further comprises: a pressing member , configured to, when the gripping portion receives the thrust, apply a force along a preset straight line to the pressure sensor to drive the pressure sensor to deform; and a preload element configured to apply a preload force to the pressure sensor; wherein a ratio of a component of the thrust received by the gripping portion along the preset straight line to a deformation amount of the pressure sensor along the preset straight line is greater than or equal to 40 N/mm. a main body comprising a moving assembly and a drive motor configured to drive the moving assembly; an operation switch connected to the drive motor; and a handle device connected to the main body; wherein the handle device comprises: an operation member comprising a gripping portion for a user to hold; a connecting rod connected to the main body; and a sensing module configured to sense a thrust that is applied to the handle device to drive the walk-behind self-propelled working machine and comprising a pressure sensor , whereby the sensing module is disposed between the operation member and the main body; characterized in that the sensing module further comprises: a pressing member , configured to, when the gripping portion receives the thrust, apply a force along a preset straight line to the pressure sensor to drive the pressure sensor to deform; and a preload element configured to apply a preload force to the pressure sensor; wherein a ratio of a component of the thrust received by the gripping portion along the preset straight line to a deformation amount of the pressure sensor along the preset straight line is greater than or equal to 40 N/mm. an operation member comprising a gripping portion for a user to hold; a connecting rod connected to the main body; and a sensing module configured to sense a thrust that is applied to the handle device to drive the walk-behind self-propelled working machine and comprising a pressure sensor , whereby the sensing module is disposed between the operation member and the main body; characterized in that the sensing module further comprises: a pressing member , configured to, when the gripping portion receives the thrust, apply a force along a preset straight line to the pressure sensor to drive the pressure sensor to deform; and a preload element configured to apply a preload force to the pressure sensor; wherein a ratio of a component of the thrust received by the gripping portion along the preset straight line to a deformation amount of the pressure sensor along the preset straight line is greater than or equal to 40 N/mm. a pressing member , configured to, when the gripping portion receives the thrust, apply a force along a preset straight line to the pressure sensor to drive the pressure sensor to deform; and a preload element configured to apply a preload force to the pressure sensor; wherein a ratio of a component of the thrust received by the gripping portion along the preset straight line to a deformation amount of the pressure sensor along the preset straight line is greater than or equal to 40 N/mm. <EOS>