A collapsible boat rowing simulator includes a beam, a T-shaped front support connected to the front end of the beam having a counter and a pair of tread plates disposed thereon, a rear support connected to an underside adjacent rear end of the beam, a middle support secured to a middle underside of the beam, a pair of oars each having a large vertical tube on inner end, a small vertical tube on outer end and a stop rod on a top, a pair of T-shaped tubes each having a vertical portion inserted through the large vertical tubes secured on lower end by a pair of elastic fasteners and a transverse portion rotatably secured to two ends of a crossed rod on the middle support, a pair of arcuate grips each having a vertical axial rod rotatably inserted into the small vertical tubes, a pair of hydraulic cylinders each having one end pivoted a crossed rod of the rear support and the other end pivoted to the elastic fasteners, a seat slidably mounted on the beam having four rollers engaged into a pair of guides in lateral sides of the beam. Both of the oars and the grips are foldable to rely on the beam.