A strictly non-blocking wavelength-selective photonic crystal (PC) router for mesh-based optical networks-on-chip (ONoC) that employs a novel crossed-waveguide structure as the routing basic unit is designed. The proposed router only consists of eight crossed-waveguides without the need for a ring resonator, and its entire structure is symmetrically distributed on the top, bottom, left, and right. When implementing the non-blocking routing function, the signal-to-noise ratio is 17.84 to 20.06 dB, and the insertion loss and crosstalk are 0.36 to 0.88 dB and (−50.3) − (−8.03) dB, respectively, when implementing the wavelength-selective routing function. Compared with existing non-blocking wavelength-selective PC routers used in ONoCs, this router not only exhibits strict non-blocking routing transmission characteristics but also has prominent features of a simple structure and easy implementation due to the absence of ring resonators. Furthermore, the proposed structure possesses good scalability and can be easily expanded to realize higher radix non-blocking optical routing systems, which have broad application prospects in ONoC.