The utility model belongs to the field of chemical industry equipment, and relates to a powder rolling machine for a laboratory, in particular to a rolling machine with adjustable rolling strength. The rolling machine comprises a working bin and a discharging hopper, wherein a rolling wheel is arranged in the working bin, and the rolling wheel is connected with a speed reducer and a control cabinet. The powder rolling machine is characterized in that the rolling machine is provided with a pressure regulating device for regulating rolling pressure, and the pressure regulating device is arranged at the position of a center shaft of the working bin; a spring is arranged above the rolling wheel, and sleeves a rotating shaft; a regulating nut is arranged at the upper end of the spring, and the stretching and retraction of the spring are regulated by rotating the nut, so that the rolling pressure can be regulated. The powder rolling machine disclosed by the utility model can regulate appropriate rolling strength according to the characteristics of powder, and the regulating manner is simple.