The utility model relates to a tablet hardness detection device which comprises a tablet straightening-out unit, the tablet straightening-out unit comprises a first channel provided with a feeding port, the first channel is approximately vertically arranged, and the inner diameter of the first channel is larger than the diameter of a tablet and smaller than the sum of the diameter of the tablet and the thickness of a single tablet; a sequencing mechanism is arranged at the outlet position of the first channel and comprises a blocking part capable of blocking the outlet of the first channel, and the blocking part controls the outlet of the first channel to be opened or closed, so that tablets in the first channel fall from the outlet one by one; the sequencing mechanism is connected with the main control chip through a wire; the device is reasonable in structural design; operators only need to put casually inspected tablets from the inlet of the device, repeated operation is not needed,the device can automatically straighten out the tablets and conduct hardness detection one by one, the number of the tablets meeting the requirements and the number of the tablets not meeting the requirements can be automatically recorded, and the operators can obtain casual inspection results.