The invention discloses an in-situ measurement method for coal rock strength and deformation modulus. The method comprises the following steps: selecting a measurement area on a tunnel, and drilling inward the coal rock in the measurement area; anchoring an anchor cable in a hole; mounting a pad on the cable body at the hole mouth to ensure that the pad and the coal rock surface are closely attached; drilling a plurality of communicated holes inward the coal rock body along the periphery of the pad to ensure that the periphery of the coal rock body corresponding to the pad is separated from aparent body; mounting a plurality of displacement sensors on the pad; performing multi-stage loading on the anchor cable by adopting anchor cable pulling equipment, recording anchor cable loading anddisplacement of the pad vertical to the coal rock surface until the coal rock is destroyed; and calculating the coal rock strength according to the maximum loading of the anchor cable, and calculating the deformation modulus according to the displacement curve of the loading. The traditional tests on the coal rock strength and the deformation modulus are performed in a laboratory by selecting a rock block, and the measurement result is greatly different from the truth. The method can accurately measure the coal rock strength and the deformation modulus, and has simple operation and low cost.