A shade screen includes a screen fabric, a tightening wire and a reinforcing connector. The reinforcing connector includes a head connecting member and a reinforcing body. The head connecting member has a through connecting slot and a peripheral securing slot. The reinforcing body has a receiving cavity, a first reinforcing groove and a second reinforcing groove formed on two sides of the receiving cavity respectively. The first reinforcing groove and the second reinforcing groove are aligned with two ends of the peripheral securing slot in such a manner that a corner portion of the screen fabric is securely attached in the receiving cavity, while the tightening portion of the tightening wire is arranged to pass through the first reinforcing groove and the second reinforcing groove and fittedly receive in the peripheral securing slot.